First off let me say you will have a great time. Gastons is a real nice place. Jim Gaston is a friend of mine and they run a top notch place. Let me highly advise you that if you could afford a guide 1 day I would hire one. 2 reasons, #1 you will be there during the spring when the water flow is real high and if you have never run a river boat he could give you some pointers and assist you in learning how to run one. #2 He could show you what tactics are working at that particular time. Remember if you sink one of their boats you are looking at $1000 recovery fee plus any damages. It can happen to anyone as I have even seen experienced guides sink them so I would think about hiring one. The best one at Gastons is Frank Saska. You can request him.
I am posting a link to a River Cam from Newlands Lodge. This is right below Gastons and you can watch the river to see the conditions and the water flow.
http://newlands.com/index.php?id=213
I dont think trout magnets will do you any good when you will be there due to the amount of water that should be coming from the dam. You just cant get them down deep enough.
The first thing you need to learn is a "White River Trout rig" I am posting a video of one below.
http://www.hisplaceresort.net/video.htm
You can use night crawlers, corn, shrimp, or trout worms tipped with a berkley power egg.
The next thing I would use would be blue fox spinners #2 and #3 in gold and silver, big stick baits that will dive down 4 to 8 feet depending on how much water is coming through the dam.
This should at least get you started. I see you live in Murfreesboro and so do I. Shoot me a PM if you want to talk one day.
Again I would highly suggest a guide at least for 1 day if possible. I think this would help make your trip so much more enjoyable and help insure yall catching some fish.
Roy