I'd like to know the steps for marketing a game starting after a gdd (game development document) is born to an actual marketed game. When to get patent (and how) on an idea (and why) and copyright (why/when).

I'm new to pursuing a marketed game with my 5 years of experience actually developing them as a director but never marketing.

EDIT:

I read a lot at toms website so I got a clearer view now. Thanks Tom!