Look, your consoles play games just fine. Some of them do other things as well, like streaming movies or facilitating identity theft. You don't need a gaming PC.
1. Should you do this?Read the rest here, seriously, it'll put a smile on your face.
Probably not. It's sort of complicated. Take this questionnaire.
Do you know how a computer works?
A. Yes. The hard drive is for long-term storage, RAM is for short-term data, and they both connect to a motherboard, which... [You continue to recite an accurate outline of a computer's workings even though I have obviously stopped listening.]
B. Yes. I type the thing into the Google, and my internet goes to the thing.
C. Yes. I push the lever down, and a few minutes later, my potato waffles are done.
For those who answered anything other than "A," put down the hammer and nails - you are not going to be building a PC today. The fact that you thought you'd be using a hammer and nails should have been a red flag.