Heartbeat, DRBD and web server Apache

Hello,
I have two virtual machines compA and CompB under Ubuntu, on both VM i have installed Debian. I succed to make to communicate with each other, I checked with the ping command.
I want to create a system with redundant Heartbeat, Drbd and Apache web server, meaning when a server is crashed(compA), second server (CompB) must take over the business.
Please help me because I have not idea where to start and how to set up programs (HeartBeat, DRBD and Apache).

 

This might give you the idea: http://www.howtoforge.com/high_availability_nfs_drbd_heartbeat