Hi,
I've done this professionally since 2006. I've done lead generation and product sales through adwords.
I know alot of tricks that can lower you pay-per-click costs. I also know of alot of 2nd teir, popups, and contextual advertising sources that can further expand you sales.
I have alot of good reviews on the buyers side, but none as a bidder. PM me and I give you some free advice about the job.
thanks