First of all, welcome to Dakka.
Second, before you think of opening a store you need to see is it viable. Price around and see what the rates/rent is like, see is there a market for what you're offering, see what games are the most popular (you may find this interesting but tangentially related
http://www.dakkadakka.com/dakkaforum/posts/list/532104.page ), try getting to know a few groups in your area and see if you can tailor what you're offering to their needs. Be aware that
GW do not seen to be treating independent retailers with great concern these days