Will I have to talk about things I don't want to?
I will never push you to talk about things you're not ready to.
You know yourself better than I do, so I trust that you will let me know if/when you are ready to. I may offer some gentle nudges if I think you are ready, but I will take your lead.
How much we focus on the past will depend on what the presenting concerns are and the approach we decide to take in therapy. Each person's needs and issues are different.