Do not start by stocking adult fish. Your best bet is to stock forage fish first(food for your predator fish)ex: bluegill, minnows, shad, etc. Once your forage species have established a healthy population, usually at least through a breeding season, then you can start to stock adult predator fish ex: large mouth bass, catfish, etc. Check into some of Bob Lusk's books they can point you in the right direction as far as establishing your pond. Do some searches through the posts here at the site and many questions will be answered by experienced pondmeisters. Good luck