Many affiliates struggle to make enough profit from the sales they make to allow them to reinvest that money into more content or marketing. Once you do find a product that people can and will buy online, make sure it offers enough commission per sale to make it worth your while. There’s little sense in promoting light bulbs for 1% profit per sale.
Mention it in a blog post. A lot of bloggers get great initial results by working backward. Make a list of your top 5 or 10 blog posts. What things would be a natural fit in there? If it's a recipe post, maybe it's a few of the necessary tools needed to complete the recipe. Include your Amazon link. If it's a potty training tale, include a list of books you read or potty training supplies you recommend. Still not sure? Google posts similar to yours. What are those people promoting within those posts?
The two main parties involved in the affiliate relationship are the merchant (sometimes also called “advertiser”), and the affiliate (sometimes called “publisher”). There are different ways to run, manage and promote affiliate programs, which involve more parties in the relationship, but the two main participants (without which the existence of the very marketing channel would’ve not been possible) are: (a) the party that has the product (or service), and (b) the party that knows how to sell it.
Once you've protected your prospecting pool, maximize your affiliate program by working with the best and leaving the rest. As the old 80/20 adage implies, most of your revenue will come from a very small percentage of your affiliates. Because it can be time-consuming to manage a larger affiliate network, consider selecting only a few companies initially, and interview them before signing them on. Affiliates are an extension of your sales force and represent your online brand, so choose partners carefully.