Which PC case to choose and where? And most importantly, how?

Question

Frame

I don’t rummage in computers at all, I got a few pieces of iron for a penny, to replace my old man:
vidyuha rx 570
mother Kllisre X79
percent Xeon E5-2640
well, some kind of block for 800v
And all this game refuses to get into my old box, like a case choose the right one and where you can snatch it cheaper? Such that when the girl saw immediately there was sex.