The PSU gives you room to add more cards on the future so it is wise for you to buy a motherboard with 6 x PCIE slots. You can buy Asus H270 prime, I have one and it works out of the box with 4 cards and you need to enable 4G decoding for 5 or more cards. Everything else is fine.
Ok, thanks, I haven't loaded an OS to a motherboard, or started a machine up from scratch, would you say it is easy to do?
Also, do you have any recommendations for a pool to start with, most people are saying NiceHash...