VLAN ID. Clarifications and suggestions for a newbie.

[DarkCorner]

Sorry, but I will have two more questions.

There is a 24 port managed switch and on this I have to create VLANs for LAN, DMZ, Guests, Home and VoIP.

With 5 interfaces, em0 is for WAN and em4 is for WAN2
I still have 3 NICs (em1/2/3)
What do you recommend me to do?
Do I create 5 VLANs distributed across the 3 NICs? For example em1 with LAN and DMZ; em2 with Guests and Home; em3 for VoIP.
Or do I aggregate the 3 NICs into one and associate all 5 VLANs on this one?

The second question is, when I configure a VLAN to an interface, for example VoIP on OPT2=em3, should the OPT2 interface be enabled or disabled?