I kept numerous native tanks. Substrate you can do what you please, Id say take rocks and wood from the creek, it looks natural, its free, and Ive never had any problems, just clean it off (boil or put in a bucket of water for a while). Now It all depends on the mood of the fish , just as if you bought them at the store, some live happily together forever, others bully anything that comes near them or will chase the others to death. I once had two lmb, with 2 bream, and bullhead and pleco. All living happily together, but recently I had an lmb with a redear that were together for 4 months and then one day the lmb decides to chase him to death for no apparent reason, sad emotionally but they are just free fish from the pond. The biggest concern of keeping lmbs with anything is that they are extraordinary predators and may often eat all the food before bream, crappie, or other less predatory fish have a chance, my lmb will have his mouth full and still go after the minnows that my other fish would go for. Fish such as Lmb and smb do get quite large but the Lmb's ive had normally start at 2 inches and typically are only 6 inches after a year. But they can reach up to 18 inches, Ive seen some youtube videos with some lunkers.
I dont know how you plan on acquiring the fish but I go out at night and wade the shores with a light and net the little guys trying to hide. Also be sure youre within state regulations when catching such fish. Catching fish with rod and reel is sometimes the only legal way but I feel like when keeping them in aquariums if you can use net its safer.