Tips for me & my horses first dressage show!?

my horse is 6 years old and we did hunters but just moved to a new barn and we're switching to 2phase. we have a schooling dressage show in a couple weeks and neither of us have ever done dressage in a show! i already have my tests memorized, and i will have a lesson the day before the show. i am doing intro tests b and c so the first is an easy W/T and the other one is WTC. does she need to be collected? will we get points off if shes not? its just intro level. what are the key things they look for? any info/tips you have would be great!!