Hi, Tisha62486!
I can't help you because I don't use a center--I just have done it on my own using the Web. The questions you ask are questions you should be asking the folks at the center when you go on Dec. 5. Make a list of them, especially about the cost, about how often, about weighing and measuring, etc. and take the list with you!
Maybe some other Medifasters can help...
Jay