Anfänger Question

[needs]

Dear Sirs,

Can you please help me to achive my plan ?

i am very new on Network ,I just want to HP 3400CL-24g switch to Sophos Firewall . I read many article on the internet but unfortunattly not success.

I need step-step guide if possible.

what i did on sophos firewall:

eth4 port connect (new interface configured on sophos)--->switch port 20  ,and i tried TRUNK is it correct? but no success.

plan:

3x vlan and all vlans has own ports .

example:

vlan 30 ISCSI on port 23 -->NAS Storage  do i need to Trunk it too?

Thank you so much for help.