The netsh command wants an appid (see here):
netsh http add sslcert ipport=0.0.0.0:8000 certhash=0000000000003ed9cd0c315bbb6dc1c08da5e6 appid={00112233-4455-6677-8899-AABBCCDDEEFF}
How am I supposed to know the GUID netsh wants me to provide?
You can use any valid GUID. It is only used to allow you to identify the binding later.