I would put it like so:
"What budget do you have in mind for this job, what are your criteria for considering the job compete, and what are the deadlines?"
If you want "витиевате", "вознаграждение" is "compensation/remuneration".
PS. Not sure whom you are talking to, but people here are usually quite straightforward, when it comes to doing business, and while politeness is a must, it should not be confused for beating about the bush and not asking direct questions in the simplest possible way.