I know a pretty cheap book you can order on Amazon. I think this may be what you're looking for.
An Incomplete Education: 3,684 Things You Should Have Learned but Probably Didn't https://www.amazon.com/dp/B000S1LE3I/ref=cm_sw_r_cp_apa_hkCCAb20QWKP3
There are plenty of books out there on writing that cover the technical, words-on-page and habit aspects of writing (I like Stein's). What I want to share has to do with expectations, and avoiding A) getting a fat head or B) beating yourself up.
Growth in a craft like writing is not linear. You get better, then you stall. Better, then stall. At the same time, your ability to judge how well you're doing is also growing, but it doesn't always stall in the same places. One skill is usually stronger than the other, but not for long. In this way, there will be alternating periods of "This is great!" and "This is shit!" as you grow in both the ability to create and the ability to judge what you've created.
The times it feels like you're doing great are times to challenge yourself by reading and writing more (and practicing your critiquing skills). There's nothing to be done for times it feels like your writing is shit except to power through—your writing probably isn't getting worse, you're just judging it differently.
Unrelated note: don't start off with novel-writing unless you have an outline handy. Practice the structure of stories, the basics of the craft, on self-contained or interlocking short stories. At this point, you'll get more practice by cranking out a so-so short story a month than laboring over a single half-decent first draft for a year—learning to finish things is its own valuable skill.
Do you know about A Sea of Words by Dean King? It’s a lexicon/companion to the series and helps with the nautical terms. There’s a German edition: https://www.amazon.de/-/en/Dean-King-ebook/dp/B007DFUQ72
White person here.
If you're this concerned about it, I would recommend having a Black beta reader(s) or sensitivity reader(s), at least for the passage(s). You could also discuss your worldbuilding with them.
You could also look at guides like How to Write Black Characters or blogs on the topic to get a better feel for Black readers and writers' perspectives.
This little book had some stylistic and practical advice:
https://www.amazon.com/How-Write-Light-Novels-Webnovels-ebook/dp/B07WRMJ663
though not much on the business side of things so you'll be on your own as far as getting published. Like other have said, LNs are not really made in the West (though they are marketed here) and the chances of getting published as a foreigner in Japan or China are probably not very good.
If you’re looking specifically at self-publishing, this book is a good place to start: https://www.amazon.com/Become-Successful-Indie-Author-Writing-ebook/dp/B07BQX2X24/ref=sr_1_6?crid=1F3C2MSLM0RL6&keywords=craig+martelle&qid=1656360396&sprefix=craig+marte%2Caps%2C158&sr=8-6
There are also quite a few others of the same caliber that get even more specific for non-fiction or particular genres. Let me know if you want any help evaluating others. The issue with books like Millionaire Fast Lane is translating the generic business topics and themes from them apply differently (or not at all) to books.
Normally I restrain myself to giving terrible or depressing life advice, but this one touched me. So instead, I'm going to drop a heavy book on you.
Check out An Incomplete Education: 3,684 Things You Should Have Learned but Probably Didn't but don't try to read it all at once as it would be overwhelming. Read it in sections that interest you as you learn related topics.
For the meat and potatoes, check out Khan Academy. Pick a subject, set yourself up as a first grader equivalent and try to do all of its tests. Grade up until you hit a wall and work their content.
I regularly do curriculum on Khan as an adult to keep my mind from turning into concrete.
There is a translated guide about how Chinese webnovelists do it with advice specific to writing webnovels:
https://www.webnovel.com/book/book-of-authors_10589139205070105
There's also a book called How to Write Light Novels and Webnovels for sale on Amazon. There are no startling insights in it, but if you haven't read anything on the subject, you might learn a thing or two.
Amazon (AMS) ads are a great place to start. If you haven't already, check out Brian Meeks book on AMS ads (https://www.amazon.com/dp/B072SNXYMY)
Start with a small daily budget, monitor your ads daily and see how they convert. Ignore the current suggested bids as they can really be out to lunch.
The problem may not be your ads at all, they could be with your blurb, your cover, your price or your look inside.
Use AMS ads to set a baseline, then if they aren't converting as well as you would like (1 in 10) then consider tweaking each of the above, one at a time, leaving enough time between changes to monitor the impacts. That way you can see if the changes are having a positive impact. It takes a while, but it is worth it to have measurable results.
I’m a white guy, so I picked this up:
Check this out: How to Write Black Characters: An Incomplete Guide (Incomplete G... https://www.amazon.com/dp/B087ZSJ9BN/ref=cm_sw_r_sms_awdb_t1_3lzHFb3HYRQPX
You can also find a lot of books on breaking stereotypes for native Americans and such on amazon/kindle.
Even writing a short story about a POC I find myself reading several books and watching some YouTube videos before hand and I notice the difference. It’s worth the time!
Good luck :)
If you're interested in getting started with self-publishing, I would read: "Write. Publish. Repeat" by Sean Platt and Johnny Truant. Be forewarned though, there is no easy money to be had in the game anymore. I busted my ass for the first six months. A lot of people romanticize what writers do but it's really just about sitting at a keyboard and pumping out words. It takes a certain amount of crazy to keep at it. Most people quit long before they reach success. The average self-published author makes less than $200 per year. Good luck!
If you're tempted to give it a go, then go for it. I'd advise you to think ahead, though. If you just write one book, you can expect it to swim and then drift downwards. I did originally think standalone before I started. My research quickly put that notiob to rest. I had to start with a series. I wrote my first three before even marketing which worked really well. (If you see my OP you can look at my stuff)
I highly recommend you read two books right now. One is this (essential): https://www.amazon.com/Publish-Repeat-No-Luck-Required-Self-Publishing-Success-ebook/dp/B00H26IFJS/ref=sr_1_1?ie=UTF8&qid=1484083927&sr=8-1&keywords=write+publish+repeat
And here's the other one - it's technically for screenwriting, but the tips in there apply to books (essential for helping you write and think about your stories): https://www.amazon.com/Story-Substance-Structure-Principles-Screenwriting/dp/0060391685/ref=sr_1_1?ie=UTF8&qid=1484083965&sr=8-1&keywords=mckee+story
Hope this helps! Am happy to help you along the way, hit me up on FaceBook if you like.
Aside from the fact that the whole sentence can be removed in this instance - no, the comma isn't exactly necessary here. I hate commas in general. Sometimes they are necessary, sometimes they are just for adding pause for the reader to take a breath.
This is one of my favorite books and has been extraordinarily helpful whenever I start questioning myself. This is just the part about commas but it might help. :)
Comma Sense by Richard Lederer