I used to train and license new foster parents. Questions that were commonly asked included:
What types of behavior do the foster kids have?
What is expected of me as a foster parent?
What kind of support do I get from the agency?
How long do the foster kids stay with us?
How old are kids in foster care?
Why are kids in foster care?
These are only a few. I would suggest to someone who is considering becoming a foster parent to ask many, many questions. Being better informed will help you to be the best foster parent you can be.