I found it helpful to keep a list of things. I would be walking down the street or eating lunch, etc... And think of something and by the time my appointment rolled around. I'd forget everything. I now keep an Evernote memo ready for every appt. That also helps me to remember past topics.
Possible topics:
Your stress levels about your gender.
What triggers your gender issues.
Thoughts on your future, next week, next month. Next year, 5 or 10 years out
Family and other relationships.
Insurance.
Suggestions of material to read (books, web...)
If you are seeing a therapist that specializes in gender issues you could ask for suggestions on support groups, medical doctors who are T friendly.
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