Hi everybody,

I want to write a new package but I did`nt work with umbraco before and I`m completely new to umbraco5, I downloaded and analysised two package source codes to understand a basic rule for package writing, but each one has specific programming format,  is anywhere that I find principles for writing a package or a plugin? how can I learn to make my own package?
any toturial ,link or even some keywords which can rescue me?