What is the type of proposal should I submit here ? What kind or on what basis should I build my proposal so that I may get easily selected or chances for my selection is high ?
Are you asking about Google Summer of Code?
Because if so, I honestly think you need to be able to answer that question yourself and demonstrate the required research, search and reading skills. Finding a suitable project is the first step, and there are already resources on the wiki to help you with that. If you can't then your chances of successfully completing a project are quite low.
