This article, while somewhat dated, has been my go-to for starting people on HTML.
BUT, have you looked into Apple's iWeb or RapidWeaver? They're both great "code-less" solutions to making a website.
The home page itself is generic, but it's alright.
The first thing I noticed on the home page is that there's very little to draw me in. I wouldn't have bothered reading the website if I didn't know that it came from a reddit post. What did it for me was the lack of "real" graphics right front centre on the home page. I saw some stock icons, and some nice gradients. It was professionally done, but the lack of a hook to draw me in made the "oh shit, a domain landing page" flag go off in me head.
I took a brief look at your screen shots on other pages. They look alright. What I would do is add a splash of colour to your home page, with a slide-carousel (right where "Welcome to Sportsgen.com" is).
Take a look at some of these sites to see what I mean:
http://www.realmacsoftware.com/rapidweaver/
Notice that there is a hook to draw you in to the app. You could have a slide carousel, first slide with your company name, and a brief thingy about your app. Next two slides could have the killer features of your app. Make sure to have visible "gumdrops" so people can easily switch slides.
I would model the features pages of your app on the rapid weaver pages. The rapid weaver pages has some dumb graphics (like that FTP/SFTP highway sign), but what it does have going for it that it's easy to read.
Overall, you've got the basis for an awesome design. Just a little polish on the home page, and you'll make a 7/10 go to a 10/10.
(BTW, my favorite program for making graphics with is Inkscape. It's fantastic for vector drawing/maniupulating. Take the time to get used to bezier curves, as well as how to do nice subtle gradients, and you'll go really far. Also, the Open-source icon sets (in svg) are just gold: you can import the icons, dissect them, move them, etc...)
TL;DR Nice website, home page needs a "hook" into your content. You've got a good start, wouldn't be hard to make a 7/10 into a 10/10.
I actually like Rapidweaver and Sandvox a bit more.
There are probably a few dozen out there, but these are the two I've worked with the most.
Take a look at both Coda and Espresso — I have both, and they're great. I recommend finding which one works best for you, because both is over-kill. If you want to work exclusively with templates, there's RapidWeaver, which is pretty interesting.
Have you tried Shopify? That said, iWeb is becoming deprecated by Apple, it hasn't been updated (majorly) in over 18 months, and Wikipedia tells me that it has been discontinued.
I would suggest using RealMac Software's RapidWeaver, which while expensive is much more adaptable/extendable than iWeb ever was, and is still supported.
Just a quick look in their Addons gallery, and I found this extension, so there is probably more out there.
You can also learn to build websites with Rapidweaver at http://www.realmacsoftware.com/rapidweaver/overview/ and www.rapidweavertutorials.com. I needed something to edit my website that was mac based and Rapidweaver was pretty good.