Being a pro means handling BUSINESS as business. It's show BIZ, not show Art. (Miss Piggy said that once!)
ALWAYS, discuss the arrangements and details of a job before you agree to anything. Get the pay plan, the method of payment, and the proper dress and gear needed for the job.
I'd advise you not to lie about experience, but instead, show a great willingness to learn and be a supportive player. You can act with confidence and display class and determination without the facade of an "imaginary" track record.

I'll bet that he respects you more for talent and honesty than bravado and hype.

Present yourself as a willing, capable member with creativity to spare. I wish you well in this pursuit. It's been a great run for me since I took my first money for singing. That was 1969, and so far, I never looked back. Good luck to you.