Tools of the Trade
Some nice clothes. Include a selection of ties. Don't dip said ties into liquor, soups, or food of any kind no matter how much you may want to.
A winning attitude. You and only you can sell your booze.
A car. Seriously, you have to get to sales calls somehow. Until jetpacks are a thing, you're stuck with a motor vehicle.
A warehouse, or employment with a company that has a warehouse. Liquor doesn't store itself.
Just, like...so much booze.
A license from your state to wholesale liquor and one from the Alcohol and Tobacco Tax and Trade Bureau for pretty much the same thing.
People skills. Unless you're selling to nonhumans, but that'd be weird.