Do your goals for the fishery correspond to the species of fish in the lake? That's minor, pushing the reset button isn't THAT expensive compared to dirt renovation work.
According to the current owner the lake has 5-7 lb class LMB but most are smaller. It also has bluegill, sunfish and some catfish. There are crappie but mostly long skinny ones.
If I had my perfect pond it would be lots of huge panfish, some decent bass and a few decent catfish. I think I can get from where it is now to where Id like it with some culling and stocking... and time.
