Should I buy a computer to create documents and never hook it to the internet?

I’m thinking about buying a relatively inexpensive computer and never connecting it to the internet or email to protect it from getting viruses. Will it work?

Will I be able to move documents to another computer by tethering it? Or, will I have to save all documents on some sort of exterior drive to transfer to a computer that I use for email if I ever need to send the document somewhere? If I can tether, will connecting the two computers allow viruses into my no internet computer?