Use the provided rewrite rule to redirect HTTPS requests to HTTP.
Use IIS Rewrite rule to redirect all HTTP request to HTTPS.
Use IIS rewrite rule to redirect (301) all www requests to non-www.
When you want to get metrics related to user interactions on various parts of your website Google Analytics (ga) event tracking can be helpful and is easy to integrate as well.
When considering SEO, either you have to stick with www versioned url or non-www URLs. Having both accessible for a domain is a bad practice.