Can someone explain how trunking in HP CLI works?

First off I am a total noob at CLI in general so please don't kill me. I have an HP ProCurve 2810 and am trying to learn CLI. At the moment I'm playing around with VLANs/Trunking and am confused as to why I can't properly create/assign a trunk port. I created 4 VLANs and I want to assign port 1 as the "trunk" port.... How would I go about doing this on the HP switch? I'm having a hard time understanding what "tagged" and "untagged" means. I also want to restrict VLAN 30 from being able to communicate with other VLANs. Any help would be much appreciated

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VLAN 1: default - no assigned ports

VLAN 10: Main - ports 1 through 6

VLAN 20: Wireless - Ports 7 through 12

VLAN 30: CCTV - ports 13 through 18

VLAN 40: Misc. - ports 19 through 24