Hi yes I meant suwari waza. Sorry for my ignorance. What are the principles of this posture?
Edited to say. By principles I mean weight distribution when one knee is up, what part of the foot is touching the floor, any little tips like that.
Is hard to explain in writing. Basically what Matthew wrote is correct. Plus keep your weight low and your head up (with "look at the ceiling but without actually looking" intent) like when you're inside someone's guard
I suggest you to get both Hiroshi Ikeda's "Za" and Roy Harris' "Takedowns from the knees" videos. Google around a bit, they are easy to find. Combine Ikeda's drills with Harris' techniques.