I have only really been drawing on the PC for a year.
I knew a littel stuff from drawing before hand on paper, but nothing special really.
You just gotta get a Drawing tablet, and draw a couple of times a week too get the right feel for it.
For the first 1-2 weeks your are not gonna be abel to draw a straight line or a circle, but you just gotta keep at it.
If you want some more tips that helped me start tell me.