u/Express_Childhood595

I’m usually an Xbox player but want to build a gaming pc, I genuinely don’t know much about them but I do have a very old one that barely turns on. I was wondering if anyone could tell me what parts and what budget I would need in order to build a decent one that is capable of running games such as rust well. Any help would be appreciated I just want to know what I’d be getting myself into. I’m in the uk btw and was considering trying to do it myself.