Changing position with motion, naming a player, zooming in?

1. I want to make a jumpscare. I need to make a moving part, and not the type Position = new.Vector3 because this basically teleports the part. I need the thing where it slides, it moves, it has motion, It's simple as going from point A to point B. I just don't know how to do it or where to find it. It says something about CFrame on the wiki but it's not explained how to use it. I just need a script for a part which changes its position with motion.

2. How do I name a player in the script? For and example I want to make the player's head invisible and I don't know the name of the player. Like game.Workspace.??????.Character.Head.Transparency = 1

3. How can I make everything except the hats and head visible while zoomed in max? Usually when you zoom in at max (first person) you can't see your arms, leg, torso, head, hats.

Thank you for your time. I am new to scripting and sorry for the stupid questions.. everyone starts from somewhere you know..