1. Maybe. Depends on seniority in class.
2. Don't come then. Most likely you'll do more than 10. I've seen out and back lines before but you can't bank on it. If you interview tell them you can't do more than 10 nights.
3. Depends on growth, never know for sure.
4. Depends on plan you end up choosing, it's not cheap. No insurance for 90 days BTW.