welcome to the boards. You will learn from the members on this board. Papasage fishes your lake each week I am sure he will respond. Checkout the other thread on blackshear they speak of the tressle and 280 bridge.
The best advice I can give, even though I have never fished Blackshear, is to make your own hotspots. You will find all the elements that make a good habitat for crappie on these pages. The main forum is great for this. I have built structure for crappie the last 25 years. Check out Jerry Blakes Building Bamboo Crappie Condos in the articles section of the site. http://www.crappie.com/condo/
This is the best and fastest producing thing I have ever used. If you drop it in the right spot,and I have yet to find a wrong spot, you will catch fish on it in 2-3 days and it will really produce well in a few weeks. If you fish very much you should make your own honey holes. It takes a while for the other fishermen to find them also. I started about a month ago or so and I have caught Crappie, bream, catfish,spotted bassstriped Bass, Hybrid Bass, and white bass on mine all on jigs or minnows. plus a few yellow perch. They work.