This is tutorial on HOW TO HOST A DEDICATED UNTURNED SERVER.
Steps:
1. Download server software in your library. Its called Unturned Dedicated Server
2. Then go to Folder where its downloaded and create a copy of ExampleServer.bat
3. Rename it how you like. For example ♥♥♥♥♥♥♥♥♥♥.bat or MyServer.bat
4. Then right click on mouse and EDIT. Open with Notepad or Notepad++ or Visaul Studio Code or with something like this
5. Delete everything from that file. Leave only @echo off and last 2 line.
6. Then you have 3 lines so you will take the middle one and there is a +LANServer/Example. You will delete the LAN and type Internet and delete Example and type name of the file like you name it in step number 3
7. Save
8. Than if you want can create a shortcut of the file and paste it on yoir desktop.
9. Open that file.bat
10. WAIT. It will load some core, asseats and lua
11. Then if it will ask, click allow access from your widnows defender firewall. It got it disabled.
12. When the loading level is 100% and nothing going on in CMD you MUST close it with command "shutdown" you cant just close it you must type "shutdown". or "shutdown 1" I'm not sure right now. Try both.
13. Now in the folder with .bat file is created a Folder named Server. Open it. And then open your server Folder. It should be only one folder there and it should be your folder.
14. Then click Server Folder.
15. Then click commands.dat, open with Notepad or something like this.
16. Then type :
Line 1: name YourServerName (f.e.: name Slota Server)
Line 2: map WhichMapYouWantToPlay (f.e: map Russia)
Line 3: perspective both (this line is for that if you want to play only first person mode or both, or third person mode)
Line 4: maxplayers 10 (number representive max players on server)
Line 5: port 27015 (it must be 27015 idk why, just type it there)
Line 6: mode normal (go easy or normal, hard is not for you fella)
17. Save and close.
18. Then go to config.json.
19. Change what you want if you dont know what to do there. Do not do anything and leave.
20. You can close everything
21. Open your server .bat file. You know that where CMD appears.
22. WAIT AGAIN.
23. If loading level is 100% and we got none errors you can run your Unturned Game
24. In Game go to servers, LAN and you should see your server here.

If your friend can not join you, I think you must open your Ports in router. If you dont know how text me or send a friend request and I will help you. See ya and have fun.