Rough notes are enough to start. The list is kept short on purpose, so there’s usually a wait of a few weeks.
Send an enquiryTell me what it is and roughly how big. Half of these begin with "you know the one where…".
A fixed price and a finish date, agreed before anything is drawn. Half up front.

You see the sketch first, with two rounds of changes, before any ink goes down.

The finished drawing as a full-size file, ready to print. If it started on paper, the original can come too.