The ancestryDNA test you did is "whole ancestry" and unlikely to help your Russsell research very much
You could do a yDNA test on a male Russell family member and see if that identifies the other Russell families who share paternal ancestry with your father. If your brothers won't help - a male Russell nephew or cousin - even a 3rd or 4th cousin can provide the profile you need.
You would use this link to order and order a 37 or 67 yDNA test. http://www.familytreedna.com/group-join.aspx?Group=russell