Separating and cloning page sets

Hi All,
I've been researching the best way to set aside either sets of pages for the team members or giving them a sub site. There are so many options that my head is starting to spin.
What is the best way?
I want to give the team members a mobile site, with a cover page, about page, gallery page and a contact page.
Is it best to just set up a separate site for each with it's own theme or to set a ser of pages dedicated to their use?
I hope this makes sense. I'm starting to get cross eyed and my brain is soon to follow if I don't take a break.

All the best