Create shared library on external drive from scratch

I have seen many posts about creating shared iTunes libraries on external drives with many different configurations, but mostly with pre-existing libraries. My question is creating the library from scratch. The purpose is obviously to share songs among several computers AND only have one copy of a song as to not take up unnecessary disk space on several computers.
All of our songs are on an external USB hard-drive attached to Airport Xtreme. Every song is in album folder, and every album folder is in an artist folder (very organized). All the artist folders (with their album and then song contents) are in a root folder called "Songs" on the external hard-drive.
We have upgraded our three Macs (iMac, MBP and MacMini) to Leopard and deleted all iTunes folders on each local hard drive (there was nothing in them anyway). We now want to create ONE iTunes folder on the hard drive so that each computer can access it. What are the steps? Here is what I "think" I've learned here on the postings with my questions:
1) First I opened iTunes on my first, main computer (iMac) and went into "Preferences" to change the iTunes music folder to [Ext HD]:iTunes:iTunes Music. The option, "Copy to music folder..." is deselected. (This will also be done on the other computers).
2) Now what to do? I could just move all of my song artist folders with their album subfolders and music files inside them, into the "iTunes Music" folder. But then what do I click to get iTunes to see all the songs and put them in its database? The other option is click "Add to Library" - but then don't I have to select all the individual songs? (I actually tried the latter method and it kept crashing). Can I just move all the folders into [Ext HD}:iTunes:iTunes Music folder and click something to get it to create its database based on all the music files that are now in its subfolders?
3) Next step. I have seen many people write that they then create an "Alias" and put the Alias in their "Music" folder on their LOCAL, computer's hard drive. Could someone now explicitly, step-by-step, describe how this is done? I assume I go to the external hard drive. Am I creating an alias of the entire "iTunes" folder, or of the "iTunes Music" subfolder, or of the library file??? Please answer this specifically.
So now I have "XXX alias" that I copy to my local, computer's hard drive and put it on my desktop. I take out the "....alias" word, and drag it to my local "Music" folder. It asks me to replace the existing folder/file, and I say yes. Correct? And then I do this on all three computers, correct?
4) Finally, after I've done all of this, I still have the following functionality questions -
4a) When we now add to the library, either from a CD or online purchase, ONE copy of the music should go in the "iTunes Music" folder on the external drive, correct?
4b) This system means that all three computers MUST have the same iTunes library, playlists, etc, correct? The downside of this system is that you cannot personalize libraries for each computer and just share the actual music files, correct? (If so, is there another process [steps 1-4 above] that results in a more customizable system where *ONLY ONE COPY* of the actual song file is shared?)
Sorry for the length of the message, and the questions. Truly I have read all the postings but was unable to map out my plan before I go and creating, finally, this one set of music that we can share. In advance, thank you all for your help.

I was afraid you'd say that, because I'm a long time Mac guy and I don't have the perfect answer. Have you ever messed with remote desktop? That'd seem to give her full access and control, something I personally wouldn't do, although it may work for you.
Another thought came to me that might work: copy over the complete library to her machine, and then when you do another major shoot, create a new catalog, edit, etc.and then import as catalog to you main one while sending her the new one.
I am sure there are more elegant solutions, but these are a couple of ways.

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Message was edited by: Dave Sawyer

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http://support.apple.com/kb/HT1364
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Create shared library on external drive from scratch

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