There is a problem with a BG only pond. Bill Cody's post that he mentioned above will help greatly but you need something in the water to take out large amounts of the BG spawns. Trophy BG ponds work by allowing a select few to get big and the predators take out the smalls. Last time I googled BG spawn amount per year it was about 60,000 eggs annually. These are per fish numbers. Think of what that looks like if you have 200-500 fish in the pond. Southern waters more and northern waters less.

Due to the mouth size of the BG, they will not be eating enough of the fry and you'll end up with an overcrowded pond full of small fish.

Most everything I have seen on Trophy BG ponds is using LMB and allow them to stunt. Anything that gets above 12-14" is culled from the pond. You want those small bass to do your work for you eating all those little BG while you promote the best looking BIG ones. Many others on the forum with loads more experience that I have but I would encourage research and reading for sure.