As you can see a little more information is needed to help you in your quest.

You are proposing to take on a big headache without some credentials. There are many aspects that you may or may not be aware of about the model hobby industry as a whole.
1) Have you ever been self-employed?
2) There is a lot of reseach to do and market studies to conduct.
3) Do you have the finacial resources to sustain a business for at least a year without little to no return on investment?
4) What size of population density is your target market?
5)What are the demands for your area? Such as, plastic models, slot cars, radio control cars/planes, model trains, etc?
6)Is this a full time venture or something to get a business license and get personal stuff at a cheaper rate?
7) Is the target area strong enough to support your shop and compete with low-ball internet or mailorder?
8)Are you sure you really are up to the fustration of competition?

These are just a few of the questions that you must answer. I wonder why if the area could support a hobby shop why one is not there now? If I could make a suggestion, I would go to the nearest sizable hobby shop near you and approuch the owner with a proposition of assiting to set you up as a satelite(sp?) store or maybe you could approch hinm with the internet side of operation for him. The owner should/could help you give the in-outs with this type of venture. He may have the experiance that you seek that may help to forma good partnership.

Just my thoughts and observations. It is a very tough way to make a living and many have gone belly up trying. You will need to cover all aspects of people's leisure time available dollars. Start small and grow.