^^ Good idea, having the newest demos will always get attention, you might also want someone in a Master Chief, Snake, Mario costume outside of you shop for the first week giving away tickets for a free hour of gameplay (like the guy in spaced but with a better costume) you will need lots of good promotion in the first weeks/months. What also helps is having a bid display for your shop with advertised events, like a Halo3 release turnament or the rankings of your shop internal Braw league.
BTW, welcome to VGcharts chipistronkin.
Never forget: If you build it they wil come.