Hi Felicia,
Don't be distressed if you don't get many takers. Many people won't be willing to make a comittment to beta-read a book for a total stranger, especially when they have no idea how long the book is or what genre it is in.
I'm a little confused -- you already have an editor and a publication deal for a book that is still a WIP? If you have an editor, why do you need a beta reader?