I'm in the market for a good PPC Management firm, but I'm not quite sure how they work... What exactly is it that they do? Do they manage the entire campaign (from keyword selection to cpc bidding)? Or do they just tell me what keywords and ppc ads work? Do they choose the PPC networks, are they private networks or major ones like Google, Bing, etc.? How do I pay for the PPC itself (not the management cost) do I pay the network directly or do I pay through the PPC management company? Any info/help is appreciated! Thanks, also any suggestions for good PPC management companies that'd be great also. Not looking for individuals but already established companies with a nice web UI.