Sorry for the very general topic, but I'm new to adCenter, and struggling to get the volume of ad impressions (and subsequently clicks) to a decent level. I am trying for reasonably high numbers of longtail phrases to try and keep costs down, and while I know this will be limiting impressions on a less busy engine such as Live, I'm interested to hear what methods people use for increasing volume of impressions. Once I have more of a significant volume I plan to work on refining my CTR etc. I suppose further keyword research on my part to identify many more related phrases, which combined should equal further exposure would be the primary concern at this point?
Well I guess I've kind of partially answered my own question, by targeting a range of phrases which simply have more traffic I've boosted the potential impressions by quite a margin.