natural induction

What are some ways to naturally bring on labor. I'm only 32 weeks, so I'm not asking for right now, but as soon as the time comes that I'm able to start doing some things to jump start the whole process, I'd like to know what I can do. I know everyone says wait until baby is ready and yes, I agree to an extent. But it's getting hard for me to walk at the end of the day because of back pain. Nothing gets rid of heartburn. I literally wake up with it. And I'm scared my stress/anxiety/depression levels are going to hurt him. I'm to the point I can't take shit any more, so please no negative comments. Just advice. :)