Thanxs for the answers but... Here in brazil the only pleco i can get is the comon one Ancistrus sp.. How do i know if its female or male since the comon one does not have the spines on theire head. And how should i choose a couple?

I wish to star breeding Loricariidae and would like to know the following things:
1) What fish is easiest to breed
2)how big does the breeding aquarium have to be?
3)how do i know if it is a he or a she?
4) how do i get a cuple can i just pick a female and a male and they will breed?
5)how do i get ...