Shreyansh,
I too am "new" (sort of-I've used very basic features of Sympy on and off since college, but never appreciated just how much more there was) to Sympy and would like to start contributing. I think the first thing to do is to go to GitHub and look for issues that are under "Easy to Solve".
They get taken awfully fast, though, and I'm going to be very occupied for the next month. But that being said, I'm open to collaboration, as well.
Ian George.