Once you've tried the 'circles' exercises, you can then play down (to the right) and up (to the left) on long slow bows. Long slow bows are really good for beginning any practice session, as they help you to focus on the core sound that you're creating, without being distracted by other techniques.

Try down bows and up bows, and then try adding different rhythms too; -- once you are feeling confident with the sound quality, try adding a steady pulse to your bowing. For example, count four beats on the down bow, and then four beats on the up bow, and so on.