Self tape tips???

I have to film a self tape tomorrow for Beetlejuice in Beetlejuice the musical (MY #1 DREAM ROLE!!!) and some tips to make it the best that it can be would be deeply appreciated.

My current plan:

Set up my phone to film

Prop up my speaker

Sing the audition song

Do the reading

Tips, tricks, anything. I want this role more than anything in the world!!