Building a computer!

I’m looking to build a computer, I have no idea what parts I need, I just want to be able to record Minecraft at around 40–50 FPS (and possibly play Black ops 2 in the future.). I don’t know what parts will do the right job or which parts are compatible. I JUST WANT TO RECORD MINECRAFT WITH GOOD FPS!!! (hint) I’ve heard that RAM plays a roll in the recording part, but other than that I need some help. So can someone please put together a list of parts! I would be greatfull! PS by buget is up to 650$.