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I do not know what you do and how you are positioned against your competitors eg. your USP's, but you need to look at your SEM campaigns as part of your overall marketing mix. To see if your overall proposition is competing aswell as it can.
Be careful when selecting an agency, especially when your budgets will be small. You may only attract those small agencies or one man bands that if they do not know totally what they are doing, may result in an increase in spend and not the corresponding increase in ROI. As they say, you get what you pay for! Good Luck
Two second rundown of what I do:
for three line ads:
first line; parrot back their search term as much as I can.
second line; qualify the user. Tell them exactly what to expect when they click on the ad.
third line: call to action. "Click here right now dognabbit!"
For landing pages, make sure whatever you're conversion thing is (a form, a shopping system, whatever) is right front and center on the landing page. If they searched for 'lady's cotton dresses', take them to a page where they can directly add lady's cotton dresses right into their shopping cart.