Everything on this list fits in one email. Sending it up front is the single biggest thing a firm can do to make the first week productive instead of a back-and-forth.
That's the whole list. Most of it is things a firm already has on hand; the value is just sending it together instead of piecemeal over the first two weeks.
Same checklist, formatted to forward to whoever on your team is kicking off the project.
Send me the scope, and I will reply with a time and price range, typically within one business day.