So I got started and am now making some money, but what things do I need to measure and improve ongoing? I guess ad CTR and ROI are the obvious ones, anything else?
Find out where your traffic is coming from, especially the ones that are converting.
And Bill gave you some bloody good advice there! I have a CTR of 250% on one of my campaigns, which makes absolutely no sense whatsoever (actually it's just the way it's reported, but still a 100% ctr means nothing).