By using a JustGiving Personal Web Page you will be able to include personal details about your project which is very easy to do.
All you do then, is email everyone you know and many friends, family and work colleagues will sponsor you, plus possibly a few people you don't even know, who might access your page.
Justgiving handle everything and even claim the gift aid for us (this adds £2.80 to every £10 sponsorship)!
The best part is - you don't have to revisit all your friends to ask them for the sponsorship money as there is no actual cash handled, its all done on line for you.