Doubts about the connection/server tickrate

I managed to create a server for the community, but I have some doubts;

My connection is 35Mbits download and 15Mbits Update. Which tick rate can I put, I can create more than 1 Server?

- Where do I change the tickrate or any value related to server connection quality?
-To create more than 1 server, takes up a VM with another OS? Can I create multiple server instances?

I created the doors in the "Virtual Servers Setup " into my router, I need to create them in the "Port Triggering Setup "?
In the game I can only find my own server for the LAN tab and not the internet, is this normal?

Doubts about the connection/server tickrate