do you have one? or are you going to be operating on a "we shall see how it goes" ideology. Thats rather risky. But some risks are worth taking!! Since you didnt mention it...how are you going to finance the purchase of the business? its a big consideration and if you have to borrow money then the lender is going to want to see a business plan as well. Then theres the sub-division of duties to perform as to who does what.
These questions can in part be answered by the small business administration who will put you in touch with the right people to talk to who have the job of taking a business idea or plan and giving you their professional opinion of its merits (for free)
(just my thoughts ok) as for relocating the whole business to a different area you might consider opening a second location without moving first and see if it takes off like a wild fire. if not you'll still have the origional in good shape to keep in business
and then you would have the option of closing that location later on. At least....think in terms of growing your business....