I need advice please, from anyone who is a self employed Excel consultant, particularly in the UK.

I am very interested in setting myself up as an Excel consultant, working from home on a part time basis. Would you be able to offer me some advice on how to go about setting up in business? How did you start, how/where do you advertise, how did you find your clients, how did you market yourself etc? How did you set your rates? What sort of thing do your clients most often want from you? Do you use Access too?
Do you have any words of wisdom for me that you wish you had known when you first started up?

I have worked with Excel for over ten years in my job as an accountant and am highly proficient in all aspects of excel except visual basic, which I am learning.

I would be extremely grateful for any responses, thanks.