How to hook up Power Mac G4 to my i.Mac

Question

Been browsing through discussions and Apple stuff, talked to support techs at Apple Care (with less than desired results), but still need help on how to do this.
Here's what I want to do: Get step-by-step instructions on how to hook up an "old" (think it was made in 1999) Power Mac G4 to my i.Mac computer.
a) primarily to serve as back-up for my documents, pictures, music, etc., even programs if that can be done, and;
b) actually use some of the old programs that are on that old G4 (i.e. Adobe Pagemaker)
Here's what I have:
1) a flat-panel i.Mac, 1 GHz PowerPC G4, 256 MB DDR SDRAM, using Panther;
2) an old Power Mac G4 (the rather large, vertical hard drive) of which I know nothing about the specs....like memory, storage, or system it has, etc......at least until I can get into it. It's been sitting idle for about four years;
3) a three-foot, 6-pin to 6-pin cable (Belkin) which I am told is what I need to connect the two computers via FireWire jacks.
So, presuming I have all that is needed to hook these two machines up, how do I proceed. A "1, 2, 3 instruction would be very much appreciated.
For example, should both computers be turned on "before" inserting the FireWire cable, or......should just the i.Mac be turned on, then insert the cable, then turn on the old Mac?
Once hooked up, and powered up, it's my understanding I'll see on icon for the old Mac on my i.Mac desktop. To copy files, I'm supposed to just drag and drop to the old Mac icon. Is that right?
Then to actually use the old Mac, I'm supposed to reboot my i.Mac, then hold down the "t" key just after the reboot "sound," or little circling icon, and I'll be in the old Mac? The screen will show everything on the "old" Mac? Is this right? Sounds simple enough, but.
If this is right and I'm actually in the old Mac, can I then sort and arrange documents I've dragged and dropped, and can I use programs that are already on that old Mac......like Pagemaker?
And, how do I get "out" of the old Mac and back into my i.Mac?
I see through discussions that I can apparently backup my entire i.Mac hard drive by going to the HD finder window and dragging and dropping my user folder icon (the little one that appears at the top and in the center of the Finder window, to the old Mac icon. Does that sound right?
I surely would appreciate some help on this. What I've got so far is piecemeal tidbits, nonsequential, and often, unclear.
Thanking anybody and everybody who might be inclined to help me out.

Answer 1

Thank you A Brody,
This is all very helpful to a guy like me.
I guess the first thing I'll have to do is get an ethernet cable. Presumably, the FireWire cable will not be needed now. Correct?
The same questions still seem to apply. I did print out the "Connecting two computers using Ethernet" that you forwarded to me.
1) But, do I power up both computers before installing Ethernet cable?
2) After following instructions on the"Connecting two computers....." will an icon appear for the old Power Mac?
3) After hooking up the Ethernet cable, do I have to re-boot, use the "T" key, to get into the old Power Mac?
4) After fiddling around on the old Power Mac, how do I get out of there and back onto my i.Mac?
5) Or, because it would be hooked up via Ethernet, could I simply go back and forth between the two computers?
By the way, after checking out your info on how to identify my old Power Mac, this is the info I've been able to glean, I think:
The old Power Mac is:
• A Power Mac G4 (PCI Graphics)........and therefore, it says, not able to serve as a target computer backup with my i.Mac
• Apparently made in 1999
• System, apparently, is OS 8.6 (my i.Mac is OS X 10.3.9...Panther)
• Model number either M7631 or M7826 (can't find it on the computer)
• Memory: PC 100 SDRAM, up to 1 GB (don't know how much it has now)
• I have no idea how much storage is available (i.e. my i.Mac is 74.5 GB (I think)
Thanking you again