2) I understand this can be difficult. My solution is, like any skill, you have to practice, practice, practice! Set yourself a task today to find 10 markets that show growing demand in Google trends. Just the broad market, eg. running. For the next 10 days, each day find 10 niche’s for 1 of the markets, eg. ultra marathon running. After 11 days you will have over 100 niche markets to explore for products. Go from there.
For example, if I talk about how cool a product is, and then you find out that I’m an affiliate for them, wouldn’t you as a conscientious observer become skeptical as to whether my information is biased, if perhaps I’m only saying how cool something is because I can get paid for it? Wouldn’t that make you question my integrity with other things I say as well?