The time between your first consultation and surgery depends on how well you understand your problem, the surgery you are having and most of all your physical condition. If you are physically ready for your surgery, for example not needing to lose weight or stop smoking, and understand all the potential benefits, risks and complications from surgery, then the time between consultation and surgery may be quite short.
Most patients having a tummy tuck or other major procedures will see their surgeon twice before the operation. This ensures the you understand everything and are well prepared for your surgery. This give you a chance to research the surgery and make sure all your questions are answered prior to surgery.
I think the right thing to do is have consultation with a plastic surgeon to see what surgery is possible and it's pros and cons. At that time the surgeon should be able to give you a guide in how long before you would be ready for surgery.