Do kids put up for adoption go through foster homes and can the foster parents keep the kids so long as they want to stay? Do they have like, a counselor or someone who checks up on them and how they're doing monthly or weekly or yearly?

Anything else that you can tell me about this topic would be greatly appreciated.

I am writing a novel about a girl in her teens who is adopted by a man and a woman who have adopted before. If you need or want more information about said novel, please just ask.