So I'm brand new to not only this forum, but computer building. In fact I've never even owned a gaming computer in my entire life and I've finally decided that it's about time to get started. So I've decided to build my very first computer. However, I am on a budget of anywhere from 400 to 700 dollars roughly. Since I'm very inexperienced I'm not entirely sure what parts I should buy. The main games I will be playing are all the source games, the most demanding one probably being Garry's Mod. So It's nothing to crazy. Basically, I'm just looking for some help to get started. Any suggestions on what parts I should be looking into?