Hate to rain on your parade mate and call me a cynical old f@rt if you like but if I were you I'd be trying to get into a good company with long term prospect for promotion, salary, pension etc etc . Something like college lecturing or one of the really big building firms down south.
Self-employment is ok for a young guy but it's a long slog and unless you intend to employ loads of employees not very well paid for the stress, hours and time you invest in it.
I've been on my own now for about 20 years and it gets more difficult every year trying to keep it all together.
There are some benefits such as doing your own thing and picking and choosing your work but there are an awful lot of negatives such as no sick pay, no holiday pay, no pension, no sickies even if you are sick and the ever constant threat of a tax investigation & etc etc.
Best of luck.