While customer input will be great, try not to allow one customer to get you stock something only they will buy. The LHBS did that here after only being open a couple months, and they have a gallon of Fermcap that is basically garbage at this point. It's a balancing act on many things. Definately try to get the local club to meet at your store if at all possible, but in my state, you can't bring homebrew into a place that already sells beer.