You'll find that a 240gb SSD is going to fill up fast, and if this PC is primarily for gaming, you should consider adding another drive or getting a bigger one; your OS is going to eat up 40-50gb alone, and your average modern title is anywhere from 15-30gb. Then add in music, movies, photos... you get the idea. I'd also suggest you add at least two fans to circulate air throughout your case.

EDIT: I didn't see you said this was your first build. Tack on another $40 (minimum) for the cheapest version of Windows. If you're willing to double that, you can get a USB drive preloaded with Windows; if you're not, add ~$30 for a standard ASUS ODD.

The reason you want additional fans in your case is to pull cool air inside and push hot air outside. As you can imagine, you need at least two fans to accomplish this. I usually put two fans on the bottom of my case, and at least one near the top. They make fans for different purposes; some are good at pushing lots of air, some are good at generating lots of pressure. Make sure you spend a bit of time researching what will work best with your setup! A small amount of research can mean a huge difference in temperature!

I like your build fairly well for the budget. My biggest suggestion would be to look into m.2 ssd's. They'll be a similar price but they have the same/better performance and take up less space, plus it's one less cable to manage. The only issue with that is I don't think the mobo you have picked out supports it, but I have seen some in the same price range that do.