First Mike, welcome to the forum...glad to have you! In any lake there will be crappies at different locations...ledges, brush, timber, banks. So don't go with a firm plan in mind, go and let the crappies tell you how to fish. Electronics and local knowledge are the best tools for fishing a new lake. Sounds like your friends have some prior experience at Twain, so try their plan first. The closest marina or bait shop will add to the plan. Truman and Twain are different lakes, so there may be big differences in the way you fish. Truman has 5 or 6 different arms, and they are all sort of like different lakes. The Grand arm is very stained most of the time and fish will be shallower than a clear arm.
I would just go and have fun with your friends and stay open to any suggestion. Keep an eye on this forum for reports from Twain.