Thank you, that did it. I tried minicom on all the port until I found one that worked and then I relinked /dev/modem to that. It turned out it was /dev/ttyS4 that I needed (which doesn't make any sense), but at least it works.
Ok, so ppp-go and kppp will now successfully connect me to my ISP. However, when I try to go into Mozilla or gaim, nothing will load or work. It is as if I am connected but I can't send or receive any data other than the initial data used to establish the connection. I thought the IP address of the ISP's nameserver part of pppsetup might be messed up (since I left it blank since the DNS should be set automatically, in Windows I never had to set up a separate IP for that and I think I got online with Linux before without finding a special IP). However, I changed this to the name of my ISP and then when I tried to connect I immediately got a 404 error, whereas before it sat there trying to find the page for a while. What could be causing this?
I'm almost there