Tip for buying a gaming PC with 1000 reais

First of all, very serious topic.

I need to build a gaming PC for myself with 1000 reais. Complete. Monitor, mouse, keyboard, CPU, GPU if possible, but it can be onboard as well.

I’m not going to play any heavy games. It’s more just to kill time on the weekend. GTA San Andreas is already more than enough for me. Maybe Minecraft at most. Call of Duty, and whatever else runs.

What do you recommend for me? I know it’s difficult, but I’d like to avoid buying used stuff that will cause problems soon after.