Harold, in addition to what you have, what you need to grab:
-Bigger power supply. 500W is more than enough for both, but with your graphics card, motherboard, memory, and cooling, you'll be running low in my opinion.
-Don't see a motherboard?
-Cooling. Really. Seriously. Get some big ol' fans, I'll be able to give you more specific advice once you give us a bit more specs. I like to keep mine around 25-30 celcius max when my comp is running.
-If you're gonna build a good comp, I suggest getting a decent sound card to make the experience complete.