Selected answers from the Dumb SEO Questions Facebook & G+ community.
George Zhu: Be specific with your keywords and target audience. Dont worry about competing for the top positions - as long as it`s bringing in the right traffic you`re winning. Make sure the landing pages are optimised (uses the right words, addresses visitors reason for visit, good call to action, etc)
Justin Y: Don`t forget to create multiple ad groups also. A/B test to see which campaigns are more effective so you`re not wasting the money you don`t have.