They have several plans to choose from, i.e. PPO, HMO... During indoc, they'll have the benefit rep. to explain them to you. I do believe they start almost right away (give or take a week after you start class).

You'll have your badge (company and ATL SIDA) by end of first week, so you can go home for the weekend. Your CASS approval should also come immediately after you get your company ID. If not, call Ashley (The most important person you need to know besides the CP and she'll set you straight.

Good luck!