I am a C developer and I work personally on PHP and have written some utility scripts using python. I don't stick to a language. I am a quick learner and I am flexible.

I would like to start with a small tasks / modules as of now until I get a hold on things.

WordPress is run by ~17% of the web and is quite welcoming to people new to the community. These two links may be helpful:

http://wp.tutsplus.com/articles/general/learning-how-to-cont...

http://codex.wordpress.org/Contributing_to_WordPress