Scam School is the best place to go. It is where I got into magic actually. I used to show scams to friends when I worked at Party City and after I left I moved on to magic. If you are only working with cards and bar stuff though I would only do stuff like card to coaster or vanishing salt. If you are a bartender your job is to serve drinks, not entertain. As a bartender I never find time to entertain and if there is time it usually doesn't warrant entertaining them. They are at a bar to watch a game usually or chat with buddies.