Step #1 - pick one of the things you listed that you enjoy most and focus on just that one thing (at least for now). I can't speak for everyone out there, but I don't hire anyone who is an editor/motion graphics/web designer/etc. guy. I only hire people who are focused on one discipline so that I know their skills are focused on what I need them for. Very few people need someone who can do web design AND editing, and even mentioning that you do such a wide variety of relatively unrelated things will work against you.
If you are asking how to start a business in this industry as opposed to how to get work doing it, that is a completely different story. I would dare say that is beyond the scope of any forum, because it takes years of working in the industry so that you develop a full working understanding of both the production process and business management.