What types of things should I ask my biological mom?

[*Rachel*]

I've never been in a situation like this (As far as I know, my parents are my biological parents) but it this is the first time you've ever spoken to her, you want to make it a bit more casual. Tell her who you are, ask her a little bit about herself (her job, who she is, where she went to school, etc.) then I'd suggest asking if you could meet in person somewhere to get to now her better.

Good luck, and I hope everything works out for you.