I wrote them at the beginning, but with 7K visitors / day (24k pageviews / day), I haven't had to contribute in quite awhile :-D
"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.