Communication!!! Be sure to email or e-card them as soon as you can, welcoming them to your team.
Introduce yourself, make sure to give them your contact info, let them know you are willing and able to help them.
After that, it's anybody's guess as to whether or not they will be active!:) CSAs are no more guaranteed than PSAs to be active. Just be sure to stay in routine contact with them, and cross your fingers, say your prayers!!:))...