I've had a few people asking if they can advertise on my website, my answer being, we've got Adsense so you need an Adwords account. On checking though, i've found when trying to test and add my site via adwords the following error comes up: 1 of the URLs entered are not available for targeting. Am i missing as setting that needs turning on in my Adsense account to allow Adwords users the ability to advertise on my site, through Adwords?
So is it best to create a channel for each for each ad unit on each page? Or stick with what im doing at the moment, which is one ad unit type (ie skyscraper), with one channel, across all pages? I presume in this case if reduces the ability for more advertisers to get seen, where as if i run seperate channels, on each page, on each ad unit, this will provide a greater variety of ads appearing sitewide?