The Do's
1)Don't have idea :)
2)Create a detailed negative words list and add it to the whole campaign (that will save you some money)
The Don't do's
1) You tell please
Can someone reccomend any free resource about it or share some tips to make our campaigns more efficient?
Silverbytes, a couple of resources that come to mind from the AdWords team:
AdWords Demos and Guides:
[adwords.google.com...]
And also:
A 41 page PDF, that has been positively mentioned in this Forum from time to time:
[google.com...]
Hope these provide you with some good reading (and perhaps a better ROI). ;)
AWA