Your website and your visitors
If you already have a website, make sure to go for affiliate programs that jell with your website theme. If your website is about cars then promoting cycle related products is going to have very less or no impact.
Secondly finding and scrutinizing your visitors and your target market is a good idea. In any affiliate program, your visitor is the one who is going to get you returns. So primarily get to know your visitors. Analyze your visitor behavior using your website statistics before deciding on which affiliate program to go for. Your objective should be to find out what your visitors are looking for and then promote products of their interest which also match with your existing products or services (if any).
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