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Hey you should pick up Koichi Tohei sensei's book " Ki in daily life" it explains all his priniciples on ki such things you are seraching for and much more.
About the center, Tanden, I wrote a text on my website: http://www.stenudd.com/aikido/tanden.htm
It includes some exercises that I have found useful for my students. Maybe center breathing is a good start. So is bokken suburi.