Get an accountant and start as a sole trader.
Also research career paths, some of them are not all they appear to be, like you said training as a sparky. Brilliant if you can get work all the time, but usually you are jumping from agency to agency to get any work.
If your handy with a spanner look into a trade account with trade parts specialist, usually all they require is company details and register you straight away in store. Get some business cards made and start off with a mobile service for servicing, quick and easy money. Sell any assets to maybe get a small diesel with 3dr's or a small van to store tools. Also with the business you can diverse, look at expanding the insurance and maybe have two business cards, one for servicing, another for mobile valet service?
Just a few idea's