I'm new to this and hope someone can help?

I'm new to this and hope someone can help?

Hi, I'm trialling zoho docs and have only 2 questions right now:
 
1. I will want to share documents and folders with 2 or 3 people and restrict access to some folders or files, is this possible?
 
2. Do we all need to have zoho email addresses?
 
Thanks. Ian