I am sure if you go to Amazon there will be books on running a small business. My advice would be to make sure you have some sort of public liability insurance, in case your partner trips over a Ming vase in their house, or you get some customer who turns nasty and tries to sue you. Keep a note of everything you purchase to run the company as it is all tax deductable, and it might be best in the long run to pay for an accountant to take care of it all for you as it would save you money in the long run probably. Also try to avoid taking phone calls and then spending ages chatting about their computer problem before you see them, they are getting free advice then and a lot of people try and ring round and do that, make sure that you make an appointment with them after a brief exchange regarding their problem.