Your numbers
Yearly, in dollars. Your best estimate is fine.
Your history (optional, but it helps)
If you have your books handy, add the hotel's yearly profit for the last three years. Operators can then bid on real numbers, and your offer says so. Fill in all three, or leave all three empty.
What you want
Every operator who bids has verified their identity and passed a background check. The flat fee you pay when you choose a bid covers those checks, and you and the operator are free to agree that they reimburse you.