What skills do bartenders need to have on their first day of work?
I would say that a working knowledge of basic liquors and basic popular drink recipes would be helpful. Also always keep your own supplies such as church keys(bottle openers), and things like that ready to go. Practice with setting up your own speed well with what you will need to get yourself in a system so that you are better able to produce faster drink times.
Multitasking is key.
So, you want to be a bartender? Becoming a bartender requires a combination of ability, knowledge, and soft skills. Make sure you're old enough. Be ready to keep moving. Be sociable and flexible.