Hi Amanda
Firstly, good luck with your new business! I do think there is a need for your service, because us women do do things differently. However, I think you might struggle if you only want to work with women, because there are a lot of men running businesses who need your help too. Some women have men working in their businesses too, so they might not know if you'll work with them or not.
I think the area in which you will certainly find lots of need is that of 'working mums' - women wanting to combine work with bringing up children. The only problem I've found with that market is that they don't always have a lot of money to spend and often try to do it themselves!
Hope that helps!
Best wishes,
Chantal
www.AppleTreeuk.com