Short answer
Ask about city experience, fee model, exclusions, consultant coordination, drawing ownership, schedule, budget checkpoints, and what happens when the plan review comments land.
Fee and scope questions
The fee discussion should cover what is included, what is hourly, what outside consultants cost, and how redesign caused by budget changes is handled.
Permit questions
Ask whether they have worked with your city, how comments are handled, and whether they anticipate planning review before building permit review.
Construction questions
Ask whether they help with bidding, contractor interviews, submittals, site visits, and field changes. Some do; some stop at permit drawings.