In addition to ad targeting and the advice giving above you should consider Split Testing your ads to make sure your getting the most bang for your buck. When you test one ad against another you get data on what is and what isn't working, can refine and optimize your ads one small element at a time and get the best ROI
Set up two or more different ads and experiment with different elements (one at a time) such as images, colors, text, fonts, positioning and calls to actions and see which performs better, then repeat using another element . With testing you will get the data you need to improve ads, find a winner and get more likes.