Split Testing is a Necessity
When you are trying to master AdWords, it's a good idea to setup multiple ads so you can test and see which one will give you the best results.
For example, you may create two identical landing pages but you'll use two different titles. Track the campaigns and see which ad gives you the best click-through.
Then you will do the same with your copy.
Make sure you have tracking on the landing page you are promoting andthe order-fulfillment page so you can keep track of how many people are actually making it to the order page and how many people are abandoning the page.
You can use Analytics Goal Tracking to help you track everything along the way.