Since you're not a complete newbie, you can actually do something useful with Heartbeat. Now that you know enough to be dangerous, let's expand on that into more real-world tasks that you will likely want to do at the next level of difficulty, without becoming a danger to yourself or others.
And, now we also begin to add some information on some of the general principles of how to architect an HA cluster, show you how the XML configuration behind the scenes works, and some of the command line tools you need to know about.
We may need to split this into a few levels... There are just so many things to think about... Here are a few - in no particular order...
restoring Heartbeat onto a machine where the configuration was wiped out