@h4ck3r9 Not sure how much you know and don't know, so ignore me if I'm being pedantic.
You need a public IP address that points to your web server, and you may need to poke a hole in your firewall.
0. Log in to the computer serving your web site and type:
$ curl icanhazip.com
This shows your public IP addr.
1. Obtain a domain name and point it to that IP addr.
2. Open port 80 in your server's firewall, and possible forward port 80 from your router to the internal IP of your web server.