As you get started in affiliate marketing, choose a single program to work at and become successful with. As tempting as it can be to join the dozens of programs you are interested in, the best way to grow your business is by starting small and expanding it slowly. This way, you find out what works and can focus on growing your business one product at a time.
People who go live on day one with a new website and a dozen different focuses may find themselves confused about why they aren't making money. With each program having various nuances and terms/conditions you would be more able to expand successfully with one program at a time.