Yes, they will hire you. Working retail is what a lot of high school kids do.
Previous job experience shouldn't be an issue. Make sure you have a good resume that outlines your achievements (academic and extracurricular) and you should be set. Chances are they won't care about your GPA, but if you made honours or what not, it can't hurt to list things like that.
Originally posted by: kevinf2090
if i do get hired will i be trained to make the drinks or will i start off at a more simple position
Yes, they will train you to use all the equipment and make all the drinks on the menu.
Edit2: My first job was at Old Navy. They trained me to use the cash registers, run the fitting rooms and other stuff you'll need. Surprisingly, I don't recall them teaching us how to fold but that could be a result of me not caring/paying attention.