I was in your position, and was lucky enough to have a roommate at the time who actually knew about and built his own PC. His advice to me was to buy a pre-built one if you really don't know what you're doing or getting into, which I didn't. So far I've been using it happily almost every day for the last 6+ years, and I've only replaced the cooling unit in it. Though I do tend to play games that aren't super intensive, I think the only game(s) I have/played that are are Spider-Man 2 and Jedi Survivor