I've long dreamed about doing this myself but simply don't have the capital and my friend who does thinks it's a bomb of an investment (he's right, but that doesn't mean I don't think he sucks for saying so
).
So whenever a thread like this comes up, I always take an interest.
Some things I've learned from watching threads like these are:
1) Don't do it.
2) See rule number 1.
3) Ok, if you're that adament, go to a small business training course at a local university. The course runs you through the creation of a business plan and highlights all the pitfalls and gives you basic accounting, marketing, budgeting, etc. skills and shows you how to do it right.
4) Learn about customer service. One of the things that tends to kill a FLGS (Friendly Local Gaming Store) is that they're simply not F. Learning to love your customer... sounds silly but if you don't know your market and don't care for them, then I assure you that they won't care for or know about you.
5) Run it as a business, not a hobby. Too many people get into it because they love the hobby but they have ZERO business sense or ability and so they end up running it as a pastime rather than a business. Stock ends up sitting on shelves for YEARS (this is not an exaggeration) because the idiots who run the place don't know jack about square footage and profitability. Then they wonder why they end up bankrupt and out of business.
6) Seek psychiatric help. Oh, you think I'm kidding? Buddy, you have to be INSANE to run an FLGS so you may as well get a piece of paper proving it