Windows:

Step 1: Download tp_dedicated_server_win_x86.zip and extract it

Step 2: Turn on the dedicated server

- If you see a console you're on the right path. Now the server should be running on port 7000.

If you want to play on LAN: 

Enter ipconfig in you command prompt and copy your IP address. Then you, the host, connect on 127.0.0.1 and the other person on the same network as you connects through the IP that you send to that person.

If you want to play through internet:

The game by default uses the port TCP + UDP 7000, so you will have to forward those on your router, this can be both easy and complicated depending on your network setup.

Another option is using free services like playit.gg to make a tunnel for your port. (or zerotier to make a virtual LAN network for you and your friends)