Dude this really is click click!! Run through the troubleshooter if your having issues - it covers pretty much every single scenario that there is issues.
Really is 30 seconds.. Have something listening.. My ubuntu vm is listening on ssh on 192.168.1.7
I create a foward, let it create your firewall rule - go to canyouseeme, unless your testing udp that you can not check like that.. Create your forward with tcp first to something listening, rdp, ssh, ftp, http, anything!! On your box running the service do a netstat, do you see it listening (netstat works both linux and windows
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