Besides what everyone else said -

Always call back when you are called for a freelance shift even if you can't make it. We will stop calling someone if they don't call back - just out of sheer courtesy.

Always be on time - and never miss a shift if you agreee to work it (unless it is absolutely necessary and make sure to call) You get 'dinged' and that info is shared with other counters/stores.

Try to see how the counter works and get in and do your part. If they want you to answer the phone like the other associates then when the phone rings - attempt to get it. Some stores don't require you to do something like that - but if they do, don't act like it's not 'your job'. Cleaning is everyone's job so do it as often as possible when there are no customers.

Learn from everyone around you. If someone has on a look you wanna learn - then ask so you can broaden your skills. Always think about learning all you can to broaden your skills. It really helps to keep your eyes open so you can see what's going on and learn and know what's happening around you (who's hiring and who's not) Like amoona said some stores just don't have the hours to hire so keep that in mind.

that's all I can think of for right now.