One of the most successful ways (not the only way) to do niche affiliate marketing is to test and optimize Google AdWords campaigns. However, the price that you will be paying to experiment campaigns and ad copies will be very high unless you really get things moving on the first try.
Another way, which most newbies will prefer is to setup a review site, promote the site and get link ranked high in search engines via article marketing and social bookmarking.
I hope the above explanation helps.
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