Not sure what you are looking for.
The jumpstart guide shall help you:
http://learn.extremenetworks.com/rs/extreme/images/Extreme-Networks-Deployment-Jumpstart.pdf
If you are in the default config, I would suggest to start by removing all the ports to the default vlan
# config vlan default del ports all
To create the two vlans, assuming they are named data and voice, with 802.1q tag 10 and 20:
# create vlan data tag 10
# create vlan voice tag 20
Add the port you need into it. Let's assume the port is port 1 and is untagged in vlan data and tagged in vlan voice:
# config vlan data add port 1
# config vlan voice add port 1 tag