I would work for someone for a while and learn every trick of the trade before going on my own. Being damn good at what you do sells jobs and that's where your focus should be. At this point, as someone who has limited experience, low price is the only way you can compete with guys who already have a solid reputation and are fighting for the same work. So you have to ask yourself; what can you offer that the other guys can't?
Versatility keeps you busy as a business owner and as an employee. The more you can do, the better. The battle is exactly the same on the employee side of things, we're all fighting for the same jobs so whoever is most versatile typically gets the nod.
Go hard, go fast, or go home