Lifeplayer is right, your earnings on that single may be negligible in the human eye. I think what you must be more worried about is how you can increase your traffic before the CPC. First things first.
Yup, plenty. I'm not sure if those clicks count in your adsense report - if so, that could've been what you saw. A lot of them are far under the 1 cent range per view To the guy above who mentioned link units, those don't show. Only if they click on ad afterwards
Yes, depending on your niche, you may get paid for impressions. But you have to get a lot of traffic for it to be worthwhile.