What is Google Adwords CPM, CPL and CPA Campaign?
Here is a great resource for you: Determining a bid option based on your goals.
If you have any further questions, please don't hesitate to ask.
Also, check out the Learn with Google site. There are lots of great videos there.
Hope this helps!
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For a short reference:
CPM: Cost Per Thousand Impressions
CPA: Cost Per Acquisition
CPL: Cost Per Lead
As far as I know Google doesn't use CPL, instead we use CPC which is Cost per Clicks. - For more click the link Tom provided.