I apologize that it has taken me this long to respond to your initial message. I have not been very involved with this network, I am hoping to change that. I'm working on updating more information and learning more about AIN. Looking forward to hearing from you!
Marv, I like to start with simple improv exercises that are low risk, like word-at-a-time story in small groups, or Mirroring in pairs. After everyone is more relaxed, you can then try inviting a few volunteers to come up in front of the group for some other exercises. The improv games I use depend on the purpose of the talk.
Good luck! -Yael
If you're new to this site or the concept of Applied Improv, you should probably start by first visiting this FAQ page to get your basic questions answered. Please see this guide for tips on how to use the AIN site. You can also watch video tutorials on using this site.