New guy with a new guy question

[tomsC10R]

Hello. I'd like to introduce myself. My name is Tom, I live in central Wisconsin. I don't have a truck yet but looking at building one in the near future. My Grandpa had a 67 C10, and get this my Uncle is still driving it year round... Poor truck. I plan on restoring that one when my Uncle's done with it... if ever -- it won't stop running

Anyways... on to my questions.

There is a 68 stepside frame for sale locally.
1) Is there any difference between the stepside frame and the fleetside frame?
2) Also does anyone know the length of a longbed frame vs. a shortbed frame?

I would like to go look at it and know what I'm looking at

Thanks,
Tom