16F first job interviews

hi! i have two interviews scheduled for next week, with one on wednesday (McDonald's) and another one thursday (Sephora at Kohl's). ive never had to complete any kind of interview before, so im a little lost when it comes to what i should do to prep for it. right now, i work in my school cafeteria, so I have food experience, but I don't know a lot about beauty in general. i am interested in it, though! i plan on majoring in biochemistry and have thought about doing some kind of cosmetic formulation.