Bluegills will taste test swimmers. So hopefully your swimmers won't care about the fish nibbling at them to see if they're edible or not.
See how much muck you have.
Check out Google Earth and Satellite images going back as many years as records are to see variances in water levels.
Consider mapping the topography of your pond to identify structure and cover, be it a gopro if water is clear enough or a sonar/depth finder.
Look around the pond and identify which of the trees you want to remove, and remove them before you place your artificial structure and habitat (so you don't have a tree fall on your newly placed artificial habitat!).
Place your habitats where best in the water and ideally where you can reach them to fish them.
