Unlike other posters here, I wouldn't recommend worrying about filtering outbound this early..
The intent of outbound filtering to prevent systems on your network from accessing the Internet, it really doesn't prevent anyone from tunnelling over common service ports, like port 80/443 for legitimate HTTP/HTTPS or even 53 for DNS.
It's easier to control inbound than outbound, and for the most part, enforcing outbound is an issue of policy.. given that this is your home network you should have no problem informing guests of your rules, if any.
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