If you have a blog and you are getting visitors to it, you can apply for any affiliate program that is related to your blog. Then put the ads in your blog and if anybody intertesed in the product that you are promoting they will buy it and you will get commission.it is highly recommended when you promote affiliate programs, to promote ir for countries like united states and united kingdom. People inthese countries are buying from the internet. We are here in middle east, we don't buy from internet. we don't have this culture.If you have E-mail list you can send a review for the product to your list and include the link for the product.You can write a review article and publish it in your blog
