Yep, a fan at the front for intake and one at the rear for exhaust will do wonders for you. I looked over the specs and didn't see what size fan it takes though, almost looks like 80mm. Fortunately they are easy to come by, lots of staples, bestbuys etc usually carry some. Screw them in, plug em in and you'll be running a good bit cooler.
If I were you, for now, I'd leave my side panel off and keep gaming.