Did you write the entries at first by yourself? They're hilarious!
"Hi, I can give you 720,000 impressions/mo to weed smokers, would you like to advertise?"
Step 2: Send an invoice using Freshbooks or Blinksale.
Step 3: Install the creative using Google Ad Manager.
You can also try setting up zones through BuySellAds.com, and advertisers can buy directly when they visit your site. They take a cut, though.