I agree with Steeldrifter and Bentflyrod, The main reason, I go to my local shop and spend untold amounts of money on tying and fly fishing stuff is that they know me by name and they really like to talk flyfishing. Even if you don't buy anything, these guys always take the time with me. I could always order the stuff online a little cheaper, but my computer dosn't talk flyfishing. It also makes it a lot easier to have something worked on for service or warrenty issues. It is a pain in the butt to send stuff back. Customer Service is the key. If you and your fellow staffers are always freindly, helpful and suggestive without being pushy, you will be sucessful. Its the little things like if you buy a new fly line from them, they spool it on the reel for you even if you didn't get the outfit from them.
I have a similar dream except I want to have a kayak fishing store with kayaks and all types of fishing gear. I hope it works out for you.