Placing ads on Google Adwords make you on top of the search results during the ad placement duration, increase your chances of attracting visitors on your website but comes with a price. Since Google enjoys the largest following, ad costs more compared with placing ads with other search engines line BING or YAHOO!
Another option is placing ads with Facebook where you can select your demographic profille like age, industry, market, etc.
I suggest you check out the ad costs for comparison purposes and be in a better position to make a good selection decision. This move will be effective only if you believe you have a great site, good contents but not attracting enough or right visitors. Otherwise, you go back and re-evaluate your site and see if improvements can be made first to achieve your SEO.