Hi,
The following will probably help you get started:
https://wiki.ubuntu.com/UbuntuDevelopment
https://wiki.ubuntu.com/BugSquad
https://wiki.ubuntu.com/MOTU
http://doc.ubuntu.com/ubuntu/packagingguide/C/
It's also a good idea to be present in the IRC channels of the teams you
want to work with
For the past several years, I have dabbled in Linux/GNU/open source/free
software, starting in 1999 when I managed my first Linux install, which was
Debian 2.0 (now THAT was dependency hell - no apt back then). Since then, I
have always been partial to the "Debian way" of doing things, as compare