the red flag is any therapist explicitly telling you "do this" as they are suppose to guide clients towards resolution of issues. they can recommend other services, but it is up to you to take up the offer.
the questions start with personal history, what your family and growing up was like, and to figure out what issues other then the obvious as part of current mental state. (gender incongruence) this will take a session or two at most.
after that the clinician will attempt to establish an image of the clients gender identity, and if there are comorbid conditions precluding medical treatment. during that time the loved/hated soc really kicks in as the clinician does the gatekeeper to try to make sure the client is aware of the medical consequences and is making an attempt to socially integrate into gender.
hope that helps
(ps: make sure they have a masters or better degree, for top surgery and starting T, it doesn't matter what creed the therapist has, but for bottom surgery it makes or breaks letters)