Standalone Web SSL on Win Server 2012

Hi
how i use a self-signed certificate or easy to buy one at best price this is for in house use.

can any one point direction to do so.

thanks

Or
Can call my web app https with out the certificate
if this yes what i have to change in the code

thanks

You can get a free SSL certificate by following the guide here: https://certbot.eff.org
(there may be other steps to use it with Xojo Web)