I'd search his name and see if you can find out anything about him. Not all doctors know what they are doing even if they do have trans patients. If you were in Sydney then Dr Hayes is the only one you'd want to see, only he's an endo not a GP.
Ask him find out what methods of HRT he can give you, pills, patches, gel, injections, implants (best). Find out what blood levels of estrogen and testosterone he is targeting. With the pills ask exactly what type they are. Some doctors prescribe some dangerous pills. Some doctors also prescribe Premarin (bad).
Ask what anti-androgens he will prescribe. Ask if he will prescribe progesterone and which type.
Do you need a letter from a psych to get HRT?
Write it down so you can look it up later.