Yeah residential construction is a battle of communication. Commercial is a battle of documentation.
That would be a red flag for me. Usually the quote process and honeymoon phase comms are good at least decent. Then comms degrade over project.
These pre construction meetings are important to set expectations. How many projects have you done? I am no expert but have done a couple.
I hope I’m not preaching to choir here. I can add or back off. This should be the honeymoon.
You should have a contract, check lists, updates, schedules, draw schedule, inspections (personal and county) , change order procedures and mark up fees pre determined etc etc. Trust but verify everything. Take picture, sketches, and notes of as built everything especially things that get covered up or underground. Good to get a list of suppliers/vendors and any subs.
Deposit. Get some interim release of lien for materials and any labor for this deposit negotiate for some % complete release if deposit is much more than material costs.
Draw schedules are notorious for front loading and usually bank controlled or inspired. Banks aren’t constructors and their draw schedules don’t reconcile easily and usually don’t have good retention.