Answer:
I start in little but I end in full you'll find me in half and complete.
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
I am a nut with a hole. What am I?
I have a foot but no leg. What am I?
What language does a billboard speak?