I tried downloading ClamAV and it could not be found. Also I'm clueless on how to install stuff using the terminal. I'm sick of windows and want to learn how this works.
Clamav is a terminal based application, so your best bet is to open a terminal and type
Note that clamav is only effective against Windows viruses. These by their nature cannot work on Linux and antivirus on Linux is therefore really just to avoid you passing viruses on to Windows users e.g. through Word documents.
Linux is not immune to malware, although a well organised and maintained Linux system is extremely well protected compared with Windows.