In addition to ewest's good advice look into Shore-Klear Plus (manufactured by those that make Aquashade) - price shop. So if a place sells Aquashade they can get Shore-Klear Plus. It contains glysophate plus a surfactant all in one jug; sold as a gallon to be mixed diluted. BE careful what you believe from those at feed stores in general, some will sell illegal stuff for ponds. I suggest you find out if the lilies are spatterdock, American lotus, white water lily or some other lily like floating plant. Do a little homework, you never get away from homework.
Based on what you've told us so far, the crappie are way too abundant probably due to too much 'cover' and too few predators. Your work will be 'cut out for you' in trying to remove enough small 'dink' crappie to get the pond back in some sort of decent balance. It will probably take at least 800-1000 removed to make a noticable impact on balance.
I suggest you get some sort of boat, used or homemade to use on the pond for angling. 3 acres of water is plenty big enough for small one man boat. A homemage boat or float device to fish from does not have to be expensive. Several pieces of styrofoam or plastic jugs on a light wooden frame would work for a HS senior. I have plans for a light weight 1/4" plywood boat; basically a big shoe box. Then the weeds are less of a problem and you can easily fish the outside edges where lots of the fish 'hang-out'. IMO a boat is indespensable for fishing in a pond with shorline weeds/string algae.
Environmental biology is a good field if you like the subject. There are some good colleges in the south for the field. Get good grades in HS, they will help you in college academics.
Last edited by Bill Cody; 01/28/11 11:23 AM.