This stuff was already covered in another thread
I'd say, start here
http://www.aikiweb.com/forums/showth...?t=8645&page=4
here
http://www.aikiweb.com/forums/showth...2&page=1&pp=25
and here
http://www.aikiweb.com/forums/showthread.php?t=8531
And shameless plug for those in the Tokyo area, I made a thread on the Bullshido page about my current instructor that can demonstrate all these concepts here
http://www.bullshido.net/forums/sho...t=26158&page=10
As for my own views of Ki, One Point, Centering etc, it has mainly to do with linking your body structure, and being able to create a (stealing terminology from Mike Sigman
) GroundPath that flows through your body. Nothing mystical about it.
As far as linking your body structure, there's many ways to do it, and they're covered in much detail in the other threads.
For starters you need to grasp the feeling of
"Stacking" your bone structure
"Standing" with the spine (requires a straight spine, and a rounding of the sacrum area)
Understanding the key aligments (elbow to knee, hand to foot, shoulder to hip)
Getting this feeling in a static position
Then getting this feeling in a moving position.
The latter being much harder.
Eventually you'll realize that in order to remain "connected" you'll have to move from your physical center. In a very "compression, expansion" type way. It'll cause a weird kind of tension to flow out to your finger tips (the common yardstick to define "ki" "qi" sensations).
Anyways that should get you started thinking at least
My two cents.
Oh and if anyone is in the Tokyo area, definitely check out that Bullshido thread, we're looking for new students...