Help setting up a music server on vps

Hi so I have a simple vps with ubuntu installed and I wanted to set up Airtime to stream audio using Darkice. There is no sound card so I was going to use Alsa and Jack to hook everything up. I'm using this guide:

http://wiki.sourcefabric.org/display/CC/Installing+without+a +Sound+Card+(v1.4)

It uses Campcaster which now is Airtime so is it fine to just follow the Airtime install and then go back to this guide to finish the setup?

Also Airtime, Darkice, Alsa and Jack all need to be on the server...if I have it right:

Airtime: Manage and schedule, upload songs to server etc
Darkice: The actual streaming uses Icecast
Alsa: To process sound with no card
Jack: To hook it all together

Okay so in the airtime install it says to add users to the www-data group but I'm doing everything with command line so how would I do that? I tried running cat /etc/group/ | more to list all the groups but www-data didn't show up.

Finally this seems really extreme but cool:
http://wiki.sourcefabric.org/display/CC/Installing+All+Softw are+for+a+Radio+Station

Do I have the necessary setup for this or no? It seems like it requires a local computer, a remote server and another machine just to run darkice....so I'm guessing no.

Anyway thanks for all the help I'm kinda clueless atm.