You'll need a stack as well, unless you get AmigaOS 3.9 (not sure about 3.5, but it is probably in that too).
You will need Kickstart 3.1 for AmigaOS 3.9 which is on CD, so you will obviously need these to upgrade to this OS.
But don't worry, there is another cheaper way...
It's been a while, but if you want to use older AmigaOS 3.0/3.1, Miami should do the trick. It is on
www.aminet.net/comm/tcp. You will need to get all the Miami32b archives appropriate to your setup, probably just main and 020. There are also some other tools there.
