Before delving into creating your own builder for JBossIDE's releng system, you should make yourself very comfortable with using the releng system. The user documentation for the releng system is here: JBossIDE Releng User Documentation

Making your own builder for the releng system is a pretty daunting task, as it takes a working knowledge of both Eclipse's build system, as well as the behavior built on top of it specifically for JBossIDE.

Before you proceed, you'll need to familiarize yourself with the Eclipse build system. Take a look at the documentation provided by Eclipse for their build system here: Eclipse build system documentation