It doesn't take much. As long as you have an internet connection you are all set. You might want to get a scanner if you want to scan custom documents. But with eFax, you can send PDF files to a fax machine right through your email. You can find more info about online fax services at
Computer Faxing. No special requirements are necessary - which beats the heck out of having to set up and install a physical fax machine. Hope that helps!