I will start a retail job next week, any advice from people from experience in retail?

I worked in an office all my life (got a degree and started working while attending university). After several years I quit the office job because the working conditions were simply unacceptable and a way worse than when I started (at the beginning it was ok). Any general advice about retail? How to do the best with collegues? Things that I have to take care particularly or pay attention? Thank you