I'm building my first computer. I was just wondering if the following components fit together and whether this is a decent build in general. Since I'm new to this, I might even be missing a couple of pieces. Do I need anything else? (I've heard things about thermal paste?) I would also appreciate any suggestions for pieces I can improve within my budget of £850. The computer is supposed to be capable of playing most games.
Case - COOLERMASTER HAF 912 Plus ATX Full Tower - Black = £65
Power Supply - OCZ 500W ModXStream Pro Power Supply = £50