1. Burn Ubuntu ISO to a disk.
2. Boot your computer with that disk.
3. Install Linux.
4. Get your hands on the driver you need for your NIC.
5. If necessary, put the driver on a floppy or cd.
6. Copy the driver from the floppy or cd to your system in /tmp.
7. Install your driver.
8. Do something like: # ifconfig eth0 up 192.168.1.11 << your ip address here or you do: # dhclient eth0 if you want a dynamic ip address.
9. If you don't get an error message, most likely everything is fine.
According to what you asked this has been answered to the best of my ability. If you need to know something in here specific, please post your detailed question here.