Honestly, I would never outsource the pillar article as no content writer will do it "the right way" for an affiliate, unless you're paying $150+.
I was talking about outsourcing other content for the site.
For the pillar articles, open up any Amazon Affiliate website (google stuff like "best survival knife") and then look at their articles structure. Just follow that and rewrite it for your own niche/products and read reviews from Amazon to describe the products better.
If your English is really really bad - I would still do this. Later go to Fiverr and find a proofreader for $5.