From the American Association of Kidney Patients:
Preparation for Dialysis: The AV Fistula - http://www.aakp.org/aakp-library/the-av-fistula/
This link is from "FISUTLAFIRST - National Vascular Access Improvement Initiative." While geared towards practitioners, the info will help patients to know and understand what needs to be done beforehand in the evaluation process and some of the potential problems.
http://www.esrdnet15.org/QI/C5E.pdf
Great information... Also remember you may want to get a second opinion as well as bascular surgeons have different comfort levels on what size veins to work with as well as using synthetic material as it is easier for them surgically.