With no magic fish, id say breed goldbalbs or fruitfish (look like tigers). Im not an expert by any means but that is what i used. And i would purchase a couple sets of low eggs to try and get the first magic fish, because it makes each fish hatch 2 babies instead of one. Allows you to grow a lot quicker even if your selling low priced fish, its still more money. Try to breed same species together until you research fish environment later on. Otherwise the babies will probably die. Fin type wont really matter in the beginning as long as they are the same type of fish you should be ok with them staying alive. Does that help any??