Welcome to the forum Jeff...
Take a look at the archives section. It is loaded with great information on anything the structure you seek information on to the problems with crappies in small ponds.
If you're looking for fish that get large and can keep the kids entertained in a half acre pond, I'd highly recommend a combination of HSB, CC and HBG. Use one or two feeders to keep them fed and you'll have a great fishery for kids.
