Looking to move from an affiliate agency to internalize the process and build key relationships with publishers/influencers.
I support Jeremy's answer above. To add: You might want to check out Impact Radius as a platform. It's not a network (well they have a marketplace - but for the sake of this example let's keep it simple) and if the impetus is bringing it in-house, I make the assumption you have the staff and expertise to do the recruiting, affiliate promotion optimization and other responsibilities of making it a worthy and profitable program.
Here if you have any questions!