Some good answers here!
Fair play if you want to give it a go on your own, wish you the best of luck. But agreeing with ElecTech asking such basic questions almost seems like you've barely looked into it. I haven't had as much experience as most people on here but still have come across tons of people who have tried various ways of starting up. Almost all have failed. The ones who haven't only haven't due the people they no, who've managed to get them bread and butter work. Even now there barely breaking even. It's always nice to think about yourself starting up because you always think you could do so much better but it's such a big risk which will almost certainly end up going wrong. Guess it depends too on how much you wanna make, earning yourself a nice wedge or getting the big bucks.
But wish you the best of luck. I'd much rather keep learning, be the best I can be, own a house or 2 and go on a couple of nice holidays a year keeping the Mrs happy.