Remote Desktop

We have the Business Internet 150 package.  I have a Windows 10 PC that is inside our network that I want to be able to Remote Desktop into from home or on the road.  I'm very new to this, and I haven't been able to find a step-by-step article to get this going.  Here's what I've done so far:

1) Logged into the Admin Tool

2) Connected Devices / Devices /   

                     Set the PC to Reserved IP

3) Advanced / Port Forwarding / Add Service

                       TCP/UDP  Port 1 to 255  Server IPv4 address to the PC    Active

What else do I need to do?  What would be the public IP address that I would use to Remote Desktop into this PC.

Thanks,

-Jeff