WELCOME TO AC!!!
Native fish require a lot of room because they grow fast and put off a lot of waste. Depending upon the type of perch you want, you'll probably want to go with at least a 55 gallon tank if you want to keep more than one.... (for small breeds like pumpkinseed sunfish, etc. Big guys will need more than that.) I wouldn't suggest keeping more than two in a tank of that size, even. Keep in mind that these fish are used to a LOT of space, to the tune of hundreds of thousands of gallons in lakes.
I would try to get the fish as young as possible, that way you can watch them grow up....
Also, once you catch a wild fish and put it in an aquarium, NEVER EVER release it back into the wild. (I could go off on a rant right now, but I won't....

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Take a look at the NANFA website (I know the url is posted somewhere in the forums, I'll edit it in when I find it....), they have some good information about keeping native fish. Searching google for "native aquarium fish" might yield some good results, too.
Good luck! Hope this helps.
EDIT: Duh....
http://www.nanfa.org