How to set up NGINX in Windows (What are the requirments?)

We are working on installing NGINX in Windows that will perform reverse proxy for us to allow users click on an url from their local desktop that will access a page set up in our virtual machine. In between there may be firewall.
URL example: http://hostsite:XX/page XX = port number

Example conf file:
Server {
location /page { proxy_pass http://vmtrueipaddress }
}

Basically user can access http://vmtrueipaddress from their desktop using http://hostsite:XX/page without going into our VM. Our conf file works before, but now we are moving to a new virtual machine.

Question: What are some requirement for this? Do we need to open port "XX" in the firewall to allow communication? Do we need to specific Host name "hostsite"? Right now http://hostsite:XX/page works within our VM, but not from desktop.

Much Appreciate,
Junior App Admin