Some Suggestions
First, for a list of things that people hate about their (F)LGS, you might want to check
this thread recently posted at RPG.net.
Just a few suggestions based on the game stores I've visited around Southern California, in no particular order:
1) Knowledgeable and non-pedantic staff. Don't be rude to people who purchase games that you don't particularly like. Try to know at least a little bit about all of the games you sell, so that you or someone else on your staff can offer pros and cons about them. This is a huge help, especially to newbie gamers.
2) Clean and semi-well groomed staff. Individuality is fine (green hair, piercings, tattoos, crazy t-shirts or clothes, etc.). Bad odor and unwashed hair is
not fine.
3) Greet customers when they come into the store. This should also involve telling your staff that they need to actually get up from the game they're playing (if you even allow them to play during work hours) and offer to help people who come into the store, especially if the customer is not someone they recognize. First impressions are key.
4) Make sure the store is clean: vaccuum the floors, clean the windows, spray some air-freshener once in a while, and dust the merchandise at least once a week. You'll need a good air-flow from fans, windows, or AC if you're going to have people game in the store. You'll also need plenty of air fresheners to get rid of food smell (chips, greasy pizza, take-out, etc.) and also just having a lot of bodies cramped into a small space.
5) Learn who your good customers are. Set up a mailing list and greet them by name. Have a monthly "customer appreciation day" by putting a new game on discount or something like that.
6) Learn which of your customers are experts in particular areas and capitalize on that expertise. If you consistently see one particular customer buying lots of minis, paints, brushes, pin-vices, etc., ask him/her to bring some sample painted minis in. If the paint-jobs are good, ask that person if he/she would be willing to do a short "seminar" on how to paint minis. Give him/her a discount on supplies or maybe just offer a flat fee. You might also offer a display area for people to display their painted minis, and potentially sell them. You could take a small percentage of the final sale as compensation for letting the seller use your display space.
7) The website idea is excellent, as are the forums here on ENWorld. The key is to keep them updated often. Having a website is useless if I check it today only to find out that the last time it was updated was November 2003. Offer discounts for finding the "special code word" on the website. Have profiles of your employees, including lists of favorite games, comics, TV shows, etc. It will give your customers a reason to engage your employees in conversation and get to know each other.
8) DO NOT shrink-wrap your books. Ever.
9) Opt-in e-mail newsletter. Content would include upcoming seminars/game days hosted by the store, new arrivals, staff reviews, and also classifieds for people seeking game groups or OOP games/comics, etc.
10) Organization. I like the idea of having a separate wall for new arrivals, with older stuff organized by company by topic. As someone pointed out, it's also important to think ahead and realize that you'll be moving your "new arrivals" to their regular section pretty quickly and you need to have room to put them.
11) Store you books upright, not flat. Storing the books flat is not only bad for the binding in the long run, but it makes it difficult to take out a book from the bottom of the pile to view.
12) I like the idea of background music. However, be careful with letting your employees bring in their own stuff. You might want to review it first. One of the stores near me plays music sometimes with a multitude of drug and sex references which, while fine for adults, is potentially off-putting for younger gamers and also some people who just don't want to be exposed to those kinds of messages. Film score music for ambience would probably be best.
More as I think of some...
Good luck with the store!