Love what you do
Starting a game shop is not easy as you may think,hence loving what you do comes as a golden rule to this.
Must get old ps3's or old xbox 360 and modify them and install games in the harddrive, this way you will have plenty games in a central unit instead of using cd's which at times get scratches or damaged.
Get screens
Its basically up to you as to what size of a screen you can afford.
Get controllers
Get timer system
This timer system will make things simple for the gameshop owner,When a gamer is playing depending on value of coin inserted the timer will give a player duration to play and when the time up the controllers will turn off automatically.