First of all, would make sure that you are asking people (call to action) to leave comments on your project should they choose to back it. I forget to do this with blog posts or when I've advised projects and it has a noticeable difference. Sometimes people just forget.
Fiction is not as much my forte, but I did an interview with some of the people who run pubslush, a crowdfunding platform for fiction literature, who gave good tips which echoed my thoughts:
http://www.crowdcrux.com/crowdfunding-t ... s-podcast/Most of your pledges I think are going to come from your own network, whether that's existing fans or friends.