Answer:
Six letters it contains. Take away the last and only twelve remains. What is the word?
Used left or right I get to travel over cobblestone or gravel. Used up I vie for sweet success used down I cause men great duress.
When you need me, you must find me. When you find me, you no longer need me. What am I?
You heard me before and then again. Afterward I die until you call me again.
What gets bigger the more you take away?
No matter how little or how much you use me, you change me every month.