Root with VPS?

Hi Guys,

I dont really know much about VPS, but this is my main question, do you get root access on it? Allowing me to create reseller accounts, etc.

Also, how many max people can there be on the VPS? and Does this mean there are that many root accounts?

Does each part of the server have a different control panel. So say 2 people were on the same VPS, one wanted cPanel, and one wanted DirectAdmin. Would it be possible?

Sorry if these questions seem dumb, but I'm just trying to find out about VPS.