Affiliate Marketing Secrets

In Tim Ferriss’s prescription for creating a business in the 4 Hour Workweek, he advises finding a market first, then making a product for them.
I have followed the steps in the book and identified a few niches I could market to. For each niche I have found several small trade magazines. So far, so good.
The problem is, after contacting the ad directors at a few of these magazines (to ask for back issues and their current rate card), they all hit me with a barrage of questions like “what’s your product URL?” and “what is your product?”
This is a catch-22, because I want to validate the magazine before I come up with a product idea, let alone launch a website.
What do I tell these folks? Has anyone here created a muse successfully following Ferriss’s steps in the 4 Hour Workweek? What’s the best way to ask for this information when you DON’T EVEN HAVE A PRODUCT ?
Thanks in advance!

I’m a freelance writer and I’m looking for websites that focus on niches such as business, food, wine, fashion, home design, etc. I have several works pending here. I just want to know which sites are accepting guest posts. Thanks!

What factors interact to produce smog? a. sunlight and pollutants from fossil fuels b. particulates and pollutants from fossil fuels c. sunlight and oxygen d. sunlight and acid rain Which of these practices has contributed to the depletion of fish populations worldwide?. a. fishing bans b. catching reproduction-age fish c. rotating catches d. harvest reduction Question 4 A predator might control an introduced species by a. keeping the population from increasing. b. causing habitat fragmentation. c. increasing available niches. d. reducing biodiversity in the area. Question 5 Which level of the food chain is most affected by biomagnification? a. secondary consumers b. producers c. tertiary consumers d. primary consumers

Hey YA! community,
I’m a computer engineering junior and I’ve been thinking a lot about the future and jobs and the like. I’m having trouble narrowing down specific fields and niches in the tech sector. I know it can be divided broadly into Hardware and Software. So can anyone give me like a breakdown of most of the fields? Stuff like computer security or whatever.
Thanks!!!!

I only have two, that I need.
Increasing the biodiversity of an ecosystem may result in more niches.
Diseases are more likely to spread in an ecosystem with high biodiversity than in an ecosystem with low biodiversity

which affiliate niches do you recommend?