Installing Tails OS
- Get a USB stick you're ready to completely format and erase. 
- Get a SD card for file storage. 
- Goto https://tails.boum.org/ on your Online Computer. 
- Follow the installation instructions for your OS (I recommend the torrent link). 
- Restart your machine and boot into the Tails USB. 
Note: While unlikely, you should verify your Tails OS ISO image. Follow the tails verification steps on a linux machine. Here's the link to the steps: https://tails.boum.org/install/expert/usb/index.en.html