Welcome Somesh,
I'd suggest having a particular goal in mind where you'd like to contribute - what areas of Django do you want to see improved? Also have a look through the ticket tracker for a easy-pickings ticket to get involved in the contribution process.
Also don't forget there are many more ways to contribute to Django than just code, for example: helping a local community event, translating Django or the docs, improving the docs, writing blog posts, contributing to one of the many third party packages, or answering questions on Stack Overflow :) :)
Adam