Making a curved line

Hello, I have been trying to work with the pen tool to make a curved line down the middle of the movie…

I am looking to make a straight line across the movie…


Then click on that line and make a couple of big “waves” in it.

Basically just to bend it a little so it looks like a big s curve going across the movie…

Anyone know where a good tutorial is on doing this?

This freaking pen tool is driving me nutsss