We have half a dozen community lakes here where I live. We also have a former Arkansas G&F bass biologist who is now the community lake biologist, the bio also gets assistance from a water quality expert with a PHD, and has a couple of interns working for him, our lakes are sort of a "lab" for thse guys. A couple of our lakes, despite heavy angling pressure, have excellent bass populations. A couple of the lakes do not support healthy bass populations.
One big issue is water clarity, clear water, though pleasing to look at, is, at least in our lakes, is not good for our bass. Clear water indicates a lack of plankton, the base of the food chain. Clear water also allows easier sunlight penetration and encourages the growth of undesirable algae and weeds. Our fisheries team spends quite a bit of time managing water clarity and encouraging plankton growth. They do this primarily through the application of phosphorous and nitrogen. Their target is 3-6 feet of clarity measured on a Secchi disk.
So it's a complex issue, and as the others have said, to do it right you'll need professional advice, and even with that advice you're looking at a long term project.