There is no true way to induce labor unless your body is ready. Even hospital inductions often fail because mom's body isn't ready.
At 37 weeks, you can start taking evening primrose oil orally, 2 caps twice a day. That will help to ripen your cervix.
Once you begin to dilate and you are in early labor, staying up right, walking, sex and nipple stimulation will help to move things along. Relaxing and not stressing is also key.
All the other mess people suggest is just that, mess.