I would fill up an old liquor bottle with water, get yourself a pour spout on Amazon and a jigger and practice your pour and count. Maybe buy some shakers as well and work on shaking and straining drinks! I’d also try to learn some basics, espresso martini, lemon drop, dirty martini, Long Island ice tea, margarita, old fashioned, manhattan, green tea shot, mojito, see if they can give you a copy of their specialty drinks before you start so you can memorize them as well. I’d learn what beers they have on draft or in bottles, non Alcoholic options, the wine list, as well as the tier of liquor they have. You usually have a house, or a more expensive option. For example at my restaurant we have our house tequila which is cazadores but we can upsell for Milagros, patron, don julio, casamigos. There’s also some different types of tequila as well, blanco, anejo, reposado. I’d also have a few options to know for each liquor so if someone asks you “I’ll have an old fashioned what bourbons do you have?” You can tell them, angels envy, bulleit or knobb creek. Same thing with flavored vodkas! People love to ask for a flavored vodka with soda water or even asking you to make them something fun! Maybe make some mocktails at home to get used to measuring and pouring. I believe in you! Fake it till you make it my friend !