Question 1: No problem at all. this is one of the basic elements of WHS. You use the Dashboard to set up your Users, the folders and their respective permissions.
Question 2: Not ideal as a web hosting platform as it has its own remote access Web page built in to allow remote administration, media streaming and file/folder access. It can be done but you would be much better with a different OS if that's your main
requirement.
Phil P.S. If you find my comment helpful or if it answers your question, please mark it as such.