Brainstorming a New Affiliate Site from Scratch

I've had an idea for a new affiliate site kicking around in my head for a while now, so I thought I'd do a live walk-through of my thought-process and analysis of whether this is an opportunity I should pursue or not.

The idea?

A comparison and review site for meal delivery services like Blue Apron, Plated, Hello Fresh, Gobble, and others.