The different color programs are pretty much based on how much you have to lose. You will probably be put on the gold program since you are wanting to lose about 11 lbs. The foods are all the same on each program, the difference is the portions and the portion sizes you are allowed.
As far as the bars, if you like them, it is cheaper to buy them for your whole program. But the choice is completely up to you. You can also not do the lites and they will bump you up one program to add in the extra food. There are several here that don't do the lites or sub the lites with Luna's or other bars. There is no secret ingredient in them to help you lose faster, they just quench the chocolate cravings for most. They will probably try to sell you vitamins too. You can get basically the same things elsewhere for cheaper. Some centers are hard core sellers and some (like mine) just throw out the idea and then let it go at that.