Hi buddy and welcome. I have been going alone for two years almost exactly to the day. I do have an electrical background with the Royal Navy Fleet air arm, the payed for me to do all my conversion courses and quals etc but i had no experience in domestic electrics as such, only what i had done myself. I set myself a few rules and goals when i set up, some of which i have to admit i gleaned from this forum and some i learned along the way.....
Price all your kit you are going to need - i think i spent about 2 - 3k to set up, you have to take that into account to repay yourself before you get a penny out of the business.
Set yourself goals - i started by trying to earn ÂŁ500 a month for the first 6 months, it's a low amount but realistic to start with, when you get to that, set yourself another. If you dont make those goals, don't worry, look at the books and see where you can improve.
Get a pricing structure sorted - i found this the hardest, one example was my first big conversion, i totally forgot to add the price for making the existing installation safe etc prior to first fixing the new interior. You are almost certainly going to be skint for the first year, so make sure you have enough capital to get you through it.
Never accept work that you are unsure about just because you need the money - easiest way to lose a reputation before you even get started. If you are unsure, tell the customer you will put a price in through the post and then go and do a lot of homework. Its no use just coming on here and asking if you don't understand WHY you are about to do certain things.
Start slowly - its going to take you a lot longer to do things than the majority of folk on this site, just make sure it's done properly, not quickly.
Don't expect the work to come to you - you need to tell builders, plumbers, kitchen fitters, anyone else that you are out there.
There are many more, i'm sure there will be much more input from the memebers here, you just need to go into it with your eyes wide open.
Good luck !!