Blog monetizing question--How do you add a product you like/endorse and receive credit?

I have a blog and often refer to products/books that I find helpful. I know about monetizing through Amazon, etc. though I have not done anything at all to monetize my blog. However, I realize that as a freelancer, another form of income (however small) would be of help to me.

1. Do you have a source/book or something that you have found helpful in monetizing a blog that is not product-driven?

2. How can you get a residual from individual products (not Amazon-linked) that you mention on your blog? For example, recently I did a story on a particular fellow who had created a documentary that I found to be really interesting. Not only did I do a full blog about the documentary, I also encouraged people to watch it when it was aired on TV and told them where they could buy it. It is not available on Amazon. Is there any way I could link my blog posting to this particular documentary site where it is for sale, and receive credit? Or would I have to contact the filmmaker and work that out with him? Even if I did, how would that be tallied (that people came from my site to purchase, that is)? Basically, how do you monetize and promote small, independent writers and independent sellers and receive a residual when you do that on your website?

I am not tech-savvy…so if you have info to share…keep that in mind. :)

Thanks for your kind attention.