BleuReynard
If I may, I would recommend printing out the Tree of Life, either with or instead of the Zodiac, as I actually found it simpler (even if you don't know anything about Qabala). It may look complex at first (and it is) but concentrating on simple things like the Hebrew letters and their meanings gives you great insight into it. Learning all about the Tree is impossible, but learning to read it is actually quite simple.
Once you know what each letter means (air, house, camel, etc.) you can look at a Tree and immediately see all the connections, parallels and like you said, how everything is connected to everything else. It is a highly useful filing cabinet for the entirety of Qabala and as an extension, Tarot, as you can see why things are as they are simply by looking at it.
Here is a link to help you with the letters:
http://www.byzant.com/mystical/kabbalah/Hebrew.aspx
The Zodaical attributions can be very confusing, for me at least, and I would recommend you delay that part.
I printed off the Hermetic Cross last night from a website as well as The Tree of Life that has illustrated the Major Arcana linking the sephiroth. The library book went from looking brand new (bought in 2006 as per a stamp on the inner cover) to looking a little ratty from me flipping back and forth for references. I really should get my own copy before I'm forced to buy this one.
Thanks for the link. It's great this forum has so many people willing to help.