My literary agency is meant to offer the interested writer a full scope of services. I do not charge a reading fee but I am selective. I have edited quite a few books that have seen publication. As an example you can see some of the children's books that I have worked on with a client named 'Uncle Fez'. You can see these books at unclefez.com
I work with the standard payment system for being a literary agent and as far as editing goes, the fees vary project to project. However, I like to work with a 1/3 deposit, 1/3 halfway, and a 1/3 final payment upon completion of the project.
Please contact me to discuss the details and the concerns that you might have.