What would be the best equipment to use? Would used equipment be better then new?
before thinking of going in to bitcoin mining, you should consider first how much is electricy in your country as needs to be almost free of cost before mining can be profitable for you and even you have free electricity it would take you around a year or so before you can get the money you investment in mining rigs alone.
This also applies for altcoins like Monero and ether, but because this is the bitcoin forum, I won't go into detail, but GPU mining such coins can give you faster roi and more profit, as well as having the benefit of GPUS keeping their cost well after you buy them. You can even game on them after they become obsolete for mining if you wish