connect Amazon VPC to LAN

We are running version 8.306 on our ASG 220s. I just set up an Amazon VPC and established the site-to-site VPN connection on our ASGs by using the config file Amazon provides for download. The VPN connection is up and running fine. However, I'm not clear on how to make the VPC available to our internal LAN and vice versa. I've been searching the forum and documentation, but haven't come across any how-tos or something similar. I would appreciate it if someone could point me in the right direction.

Thanks!