Cosmetic sales associate?!

Aubrey
Tomorrow I have an interview to be a cosmetic sales associate for Dior at Dillard's .. The lady basically approached me an asked me to work for her... I have no retail experience though and im unsure of how to transition from lifeguarding to going to school/ working as a cosmetic sales associate. Any tips?! Also WHAT SHOULD I WEAR?! And how should I wear my makeup? Should I play up my lips?