This site provides a nice simple overview, .. (Follow this link to read the complete article)
http://www.idoblogs.com/2010/07/16/how-can-you-make-money-with-blogs/
Sell Advertising:
Selling Other People’s Products:
Direct Sales:
Network Marketing.
This sentence (quoted-below) is the most relevant for me.
Be sure to recommend only those products or services that you know are reputable and that you trust in. Your blog’s readers will not be interested in tacky sales pitches or overstated promises, so avoid these by all means.