The right side should be specified in the pattern. If you are doing stockingette stitch, the right side is the side you want to show (with the little Vs). I don't get the "every other side" bit. It seems to me that you will decrease on each end of EVERY OTHER right side row TWO TIMES, and after that on each end of EVERY right side row 17 times. I hope that seems clear. :D
Only a life lived for others is worth living.
- Albert Einstein