I agree that many company can simply purchase a registration, however, in most cases doesn't having the actually paper indicate a higher quality product. As I said, "In most cases"!!
John
http://www.iso9001compliance.com/ISO-9001-2008
Yes, I would recommend a router also. Doing a direct connect with a cross-over cable isn't going to be very fruitful.
Once you have a router, that gives you the capability to connect them to the internet and wireless as well if it is a wireless router.
John...