If you want to get the kind of traffic that can be converted into some tangible results then there are two steps to take: Optimize your site for the right search engine keyword or keywords and promote this site in places where your target audience frequents.
If you are not sure how the usual Internet surfer does his or her surfing, then go to the www.overture.com site and use the search term suggestion tool, and you will see approximately how many people searched for a particular term and what variations they used during the past month.
If you get your search engine keyword or keywords right, and if your site is properly optimized for that keyword, then the people who visit your site will be more likely to follow through and buy your product or sign up for your newsletter, or take the actions which you most desire them to take.
Also, once you have your proper keyword or keywords selected and properly blended into your site you can get highly targeted traffic via pay per click advertising. This can be expensive, but if your site can really convert visitors to buyers then it is the fastest way to get results.
Another way to get targeted traffic is to actively promote your site in places where your target audience is located. Imagine what your average customer looks like, how old she or he may be, what they wear, where they live, and most importantly, where they hang out on the web. What kind of websites do they visit?
When this is clear in your mind, then you have to bring your site to the notice of this target audience.