Amazon’s affiliate program is the most popular of them all. I don’t participate myself (yet) but the majority of affiliate marketers I know use Amazon because… it’s Amazon. You can review products you have used or write tutorials (eg. how to connect computer to TV) and drop an affiliate link to an HDMI cable… just a couple examples. You may want to build relationships with the manufacturers so you can get products before they’re released – giving you time to create a review before the product is launched and capture sales during peak buying times.
I would probably rely mostly on Amazon as an affiliate – talk about products you use while using an affiliate link. You don’t necessarily have to focus your entire content on reviewing products, just mention them in your articles and your experience with them – how they helped you. Amazon is good for obvious reasons – super high conversions and most products already have lots of reviews which is very valuable as an affiliate.
(Also, did you notice Michelle said you don’t even need to HAVE a blog to be a successful affiliate marketer?! I thought that part was pretty interesting. Meaning affiliate marketing would be a great side income option for anyone who was willing to learn to do it and put the effort into a social media account – like Facebook, Twitter or Instagram.)
Your life situation might dictate that $200/day is the pinnacle of financial motivation. You can drive yourself to attain this goal, but any further and the motivation begins to slip. That’s a point of diminishing returns. Call it your comfort zone. Any work to advance beyond this point comes with the additional burden of pushing you out of that comfort zone. And so procrastination sets in, along with the dual crippling fears of failure and success.