If you’re on the internet a lot, you’ll realize that it’s filled with blogs of all shapes, sizes, and stripes. Many are utilized by businesses as a way of extending their brand and pulling in more customers. Others are just people who are taking advantage of a platform so that they can put…
1 - start by reviewing stuff you already use and love
2 - make contact with PR reps or directly with the publicity contact for the companies who put out the products you're interested in reviewing (P.S. after a while, you'll start getting contact directly FROM reps who want YOU to feature their products)
The best piece of advice I can give you is to say that the more exposure you have and the more PR reps like your blogging and writing style, the better chance you have of getting contacted directly, and then the product review requests will start trickling in.