Meaning?

Hi,

What is the meaning of" his own saturation" and "through the scripts" and also"media buys" in the following text?

Ron Fisk himself did not comprehend the scope of his own saturation. He had performed for the cameras, changed into various outfits, worked his way through the scripts, and he was aware of the budget and the media buys....

Please note that the context is a campaign.

Thanks