BGP routing information

We have two T1 lines from different ISPs for redundancy. Each line goes to its own router(Cisco 3640s). I have been given the job of implementing BGP on the routers. I am familiar with basic router configuration, but I know very little about BGP at this point.

Can anyone point me to some simple examples and how-to documents? Everything I have found so far mainly deals with the advanced options. I just want something that will show the basic configuration that I need to get it working sothat both routers can advertise routes into our network.