The traditions of Zen practice may seem confusing at first. But soon, each gasho and posture becomes second nature. Don't distract yourself by worrying "Am I doing this right?" It's called practice for a reason.
A few things to keep in mind:
Before sitting zazen, bow toward your cushion, then bow outward toward the center of the room. Then sit.
When the bell rings to end a zazen session, bow toward the wall from a seated position before standing up.
At the end of a kinhin (walking meditation) session, bow in place before walking briskly back to your cushion. Bow inward toward the group.
Shoes should be left outside the door or on the side of the room with the sofas. Please, no pagers or cell phones.