Hi -
Well, I think the easiest way to share files is using AmigaExplorer and a nulmodem serial port connection. Amiga Explorer come with Claonto's Amiga Forever Amiga emulator package.
The more challenging way is what you have in-mind. Have you already configured the TCP/IP stack on your Amiga2000 to directly access the internet using Miami or Genesis? Or are you just daisy chaining the Amiga 2000 to your PC
and then the PC to your cable modem/router?
No matter, you should check out the website
http://samba/amigaworld.net/That shows how to get things connected and use the program SAMBA to connect-up and network your machines.
I've heard that Samba is hard to configure hence the title of the webpage Welcome to Amiga Samba for Idiots.
Good luck. This should be a fun project. I so far mostly sneaker net burning CDs or swapping PC format ZIP disks.