Review Blog or Webshop

Hi BHW!

I got a great product category keyword but I don't know what to do. I really want to get started but I'm not confident about my knowledge. I can either create a review blog or so called amazon webstore but I'm not sure which one to choose as I never created/ranked a webshop.

I got some questions I hope you can answer or maybe provide reading material for (most appreciated!)
1. Is conversion higher with a review blog or a webshop? What are the ups and downs?
2. How can I do SEO for a webshop? Can you link me any helpful tutorial or guide for this?
3. Will page 1 on Google for a keyword give me enough 'authority' in the eyes of the consumer to actually buy something from a webshop? Wouldn't a personal blog be more persuasive?

Products are of high-value (+-$300<->+-$3000)

I am looking forward to your responses!