need analytics expert to help set up google analytics on 25 sites (all same structure)

Hi, i want to redo the google analytics on our network of around 25 sites, 20 pages or so each. i need somebody to set it up where i can see all visitors to the entire network of sites, as well as per each individual site i have a user-defined filter where i can see the referring urls and i would like to keep that, but also set up goals for that to connect to our lead forms make sure a visitor is counted through the entire network as a unique visitor rather than multiple visitors when they jump across domains