hi hannah ... these are some ways to promote affiliate program:
Good Sales Letter
Your sales letter is considered to be the key point for boosting your sales. It should be convincing enough for your consumer to want to buy. A good sales letter will attract visitors. You should also add some testimonials in it to make it more effective and believable.
Money Back Guarantee
If you want consumers to buy your product with no hesitation, then give them the benefit of a money back guarantee. If the affiliate program owner is not providing this guarantee with the product, then you should look for another merchant.
Physical address and contact info must be given on the site. This makes your website more reliable and trusted by your customers.
Choose the affiliate program that can show you the real-time statistics of your visitors and sales. This will tell how many visitors are going to the merchant website from your website and how many visitors are converted into buyers. This will help you to see your progress.
Hope they help you...