how do I transfer my personal videos to my pc?

I have downloaded Itunes and logged in. I plugged my iphone into my pc with a usb cable. I believe I am following directions correctly but my videos are not showing. I am trying to download all my personal videos to my pc to put on a drive so show my kids. BUT its over 1000 videos of the last 6 years...which may be my issues. Any help is appreciated!

Thanks!

CC