#3. https://zorinos.com/help/system-requirements/
#4. You are a user. If you use sudo/su in terminal or you use Synaptic Installing packages using Synaptic Package Manager GUI then you are a super user (“admin” equivalent).
#6. Additional drivers are under Software Updater -> Settings -> Additional Drivers. Is your mouse not working as-is? If it is, then can you please elaborate why you need elecom mouse assistant? If you still feel the need for it then the manufacturer should provide a Linux equivalent - they are also the ones who provide the Windows driver. The difference is that manufacturers show a preference toward providing drivers for windows over other OSs.