What type of package are you looking to build? The steps can be different. But to generalize an answer,
You will need Avalanche Package Builder. You can download it at http://www.wavelink.com/Download-Avalanche-Package-Builder-Software/
From here you will have several package building options. If you are new to package builder I would suggest using version 184.108.40.206. I suggest this because it has can help walk you through a basic package.
Package Builder does not have any default settings or device settings. It will house a payload of your choosing and it will build an AVA file for it. There are some post install scripting options for things like rebooting after install, or silently install a cab file.