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!
Be sure to check out the this forum: https://www.kboards.com/index.php/board,60.0.html
I haven't published yet but I've done lots of research on self publishing and it seems like the most common advice is start working on your next book. Most successful self-published authors only got there after having multiple books released.
You might also check out the book Write. Publish. Repeat.
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.