Do You What Is The Percentage Of People Using Adwords
#1 Create a list with all possible keywords that fit to your product, service or whatever you are promoting. The more words you come up with, the more chances you get of finding the niche keyword which brings me to point 2
#2 Niche Keywords. Drill down deep into the word, expand on it. For example, if you are promoting affiliate products related to mothballs. Instead of just mothballs you can use mothballs for sale, mothballs for sale in uk, motballs , discount mothball etc The possibilities are quite huge. Use a combination of misspellings, adjectives and country locations.
#4 I usually choose NOT to advertise on content opting purely for search as they are more targeted and is of higher quality. BUT if I am targeting a highly competitive area where ads are like $0.80 per click, I would turn on advertising for content while disabling adwords for searching(lowering bid price). I would have total control over costs while having traffic extremely cheap.