Draw a lot.
Don’t be precious about materials. Don’t use fancy art board or moleskines. Get a big newsprint pad or a stack of cheap legal pads from Staples. You want to draw as much and as quickly as possible, without being worried about wasting expensive paper.
Draw fearlessly.
Use a pen or Sharpie. No erasers, no correcting fluid. Fill the page completely as fast as you can. Use loose scribbles and gestures. Don’t sweat details. Use The Force — let go your feelings, young Skywalker. Get it right the first time or start over. Try to push each drawing to completion, but if you’re really not happy with where it’s going, toss it in the recycling and move on. Also try drawing without looking at the page. Get ready to be pleasantly surprised by the result.