Nothing is decided before you have been examined and had it explained to you.
Any dental insurance details you have, a list of medications you take, and the name of your previous dentist if there are records to transfer.
Longer than a routine visit, because it includes a full examination and a conversation about your history. Ask when you book so you can plan your day.
Say so when you book, and again when you arrive. Being told in advance changes how an appointment is run — the pace, the explanation, and the option to stop and check in. It is a very common thing to raise.