I found this book invaluable when starting my business in 2008. The book includes marketing information, accounting help and example letters that provide a good starting point when you feel out of your depth and on your own!
It really was the best purchase I made and helped me with so many decisions that proved the right ones!
My only gripe was that it was based around US VA's and not UK - although this can easily be overlooked with a bit of common sense.
I would recommend to all virtual assistants already in business and the people still in the process of thinking of 'going alone'.