got 2 friends running this and one of my teachers.
best place is the site lovetone posted. my teacher runs every year and always gets donations off there, half the time he doesnt even know the people that have donated, they just like the cause and give.
go make a page on there, email the link to everyone you know, get your parents to email it round work and all their friends, ask school to send a letter out about it to parents.
its a great site.