Just what the title says; I'm new to PC building and I would be extremely happy for help.
it would easily power it (although this reliable EVGA 600B is currently cheaper) by why an i3 on z87 board and only a gtx650 (for $129!) when for an extra $10 you can get a 265 which is far better or for $60, you could get this 250x which is still better than a gtx650 - benchamrks
This is a temporary start set-up. I'm going to upgrade it every so often, because I need a PC to get money.
In which case go for the 600B (so you have a good psu for overclocking and gpu upgrades), and so you don't spend too much now opt for the pentium G3258 (perhaps to practise over clocking) seeing as you already have a cooler and z board, and the 250X (as you weren't going to get that much gaming performance out of 650 anyway).
I don't really want to cheap out on a PSU, hence it having the chance to fry all of my components in a second.