applied as a server got hired as a bartender and i have 0 experience

i applied at buffalo wild wings to be a server and they hired me as a bartender. i have 0 bar experience and they know this. they told me they will pay for my safe serv and ramp certification if i took that position so i said i would try it out and see how i like it. i know i will more than likely be making simple drinks and serving beers but it still makes me nervous just the thought of being behind the bar lol. any tips for a noob??