External scripts - template or how-to ?

It's me again :) Just installed my first hobbit server - and now I can't wait to stuff more and more tests into the box. Hobbit does come with a lot of predefined tests, but I've come to the point where I'd like to create my own external test. Is there a skeleton or template for ext scripts somewhere ? Or perhaps a nice HOW-TO ? Poking around on the web gives me some ideas ( how to launch, use bbhostgrep, ect. ) - but I'm sure some of you guys have allready done this. For instance, how do you determine if tests should be done on the ip-addresse or the host name ? Thanks for your time ... /Torben