Asked questions:

~ do you pole vault inside in the winter time?
They do make indoor pole vault pits. However, they are very expensive and you need a facilities that can hold the pit and that is hard to find. So in the winter it is a good idea to work on your form. There are many drills that will befit your vaulting for the Track season that can be done inside.

~How long did it take me to master the sport?
I started pole vaulting when i was in middle school. However, the more you do it the more you learn and there is always room for improvement. so i have not mastered the sport yet!

~How about the landing? That must have to be done just right as well.
The landing is actually the last step to really learn in pole vaulting. the take off and jump are way more important. plus it is pretty hard to hurt yourself on your way down because the pit is huge.