WAAPA Audition questions

Hi everyone! I'm auditioning for WAAPA Music Theater next month in Brisbane, and just had a couple of questions for anyone who can help. 1. One of my songs, I haven't been able to find the sheet music for (don't want to give anything away - but it doesn't really exist). Would it be disadvantageous to sing something a cappella? It's a great song and I'm really in love with it. 2. Are the auditions held in front of the other auditionees? 3. I'm really not a very experienced dancer - and on the off chance I make it through to the dance audition, is it really complicated, or do they just want to see you can take direction etc? Also, what sort of shoes would I be expected to have for that? Thanks heaps everyone!!! Cross your arms and legs and anything else you can cross for me! :)