Hi & Welcome! 

A good starting point is the introduction of 

http://wiki.inkscape.org/wiki/index.php/Google_Summer_of_Code

You next steps will be twofold:

(1) get two patches accepted (bugfixes for instance) in the codebase, and

(2) Decide which project interests you most, and discuss it in details with the mentor for what it will require. Good applications include way more details than the proposals, and a clear roadmap 

Hi
I am interested in some of your listed projects. I have good enough
knowledge in C++ and have worked earlier on web development projects.

   - Better CSS Style Sheet support
   - Slice Items
   - Refactoring
   - Path Library Improvements

Please suggest where to start before preparing the proposal

Ashwini Jha
IIT Indore
2nd year CSE UG

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