Load balancer and DNS records


Hello, I hope I am posting in the right thread.
After watching all tutorials in YT and reading from some articles, I think my load balancer is not set up correctly. In my DNS list I can see on top the type LB record for my LB but if I don’t declare in the list A records for my origin servers my website is down.
So for start, do I need to add A records in my DNS list for all origin servers under load balancer cause I can’t find any information about this?
Also there is no way to make it right and set up a Health check for my servers. I can only make it work with a TCP check in port 80.
The specific domain is hosted in 2 virtualmin servers (+ all subdomains) which are almost identical and using flexible ssl from cloudflare.
Any help would be appreciated.
Thank you.