Great tips! Since I just started blogging in January I am still really just getting my toes wet in affiliates. However, I did notice that pictures and real life demonstrations of the product really help. For instance, I have several food posts where I talk about my favorite cook books and show what I have cooked out of them, and then included amazon links, sure enough I sold a few cook books.
Yes and no. Affiliate marketing can generate passive income, but the passive side of the income usually only follows putting in a few years of hard work to generate the brand and audience you'll need to begin generating those passive sales. I have multiple sites earning passive income, but each of those sites took a lot of front end work to build up to that point. And not every site gets to the point of passive income. Some sites require continual maintenance though the revenue they generate can also allow you to pay for that maintenance to be done vs. you needing to do it yourself.