Here is a short video (actually part 3 of the video I last showed you guys) that sums up building a gaming setup. It actually goes over things that you need to know, even if you are not building a computer simply for video games. Things like efficiency in hardware parts (like CPU, cooling system, etc) and how and why they work.
Give the video a watch and if you have questions, you can go over to the creator of the video (not me) or you can comment or message me instead. I am willing to help anyone that is giving this awesome hobby a try. Let me know!