I am thinking about using Affiliate Marketing on my website, where I’m selling an e-book. I don’t know much about it, but was wondering if anyone’s used it before and what things I should consider before going ahead with it.

Find out if there is an affiliate program related to the book you want to sell. If it’s an ebook, you’ll most likely find it on clickbank. If it’s a hard copy, you could join any merchant that offers this book and has an affiliate or partner program (amazon, barnes&nobles,…).
Then you place your referral link on your website, each time someone clicks on your link and buys, you get a commission.

The hardest thing will be to get traffic to your site, starting out I would definitely recommend article marketing as this doesn’t cost you anything. You write articles related to the product you’re selling and then link them to your website/blog with the review.

You can start with affiliate marketing for free, so apart from the time and effort you have to put in, there really is nothing to lose.