Antivirus

Nope' but concern is good.

If you are concerned, start with > macOS - Security - Apple

then move onto other goodies like > http://www.thesafemac.com/mmg/

and > Mac OS X Security Configuration Guide - Apple Support

Do no use any "cleaning", "optimizing" or "speedup" apps on your Mac. They are not needed and do more harm than good.

No.

1. Do I need an anti-Virus?

2. Is there any device that could clean-up my MacBook Pro as well. I get lots of offers for both, but I don't want to mess up my computer.