With the standard rules in QS a regular user would not be able to see data manager or data loader by default. They also should not be able to edit existing sheets. Depending on their setup they may be able to create new sheets that belong to them.
Section access should work the same as it is in Qlikview to limit what data they can see.
If you have not already you might want to look into Governed Self Service setup from Qlik. I have implemented on our system and it really works quite nicely to control what kind of access people have depending on their roles.