You should ask your question at http://linuxquestions.org/
The people there are very helpful.
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I've never used Debian, but here's my advice for what it's worth:
Most network card manufacturers do NOT make Linux drivers. If you are lucky, someone else may have made one. What wireless card/device are you using? Can you temporarily use ethernet instead?
As for your nvidia drivers for your 8500, you may need to download them. Get the right file for your system:
32-bit:
http://us.download.nvidia.com/XFree86/Linux-x86/169.09/NVIDIA-Linux-x86-169.09-pkg1.run
64-bit:
http://us.download.nvidia.com/XFree86/Linux-x86_64/169.09/NVIDIA-Linux-x86_64-169.09-pkg2.run
If you get your wireless working, or just plug in ethernet temporarily, you can download the file in bash:
wget http://(url)<enter>
If you can't do that, you'll need to burn it on a CD or something. Once you have access to it in bash, do this:
chmod 0777 NV<tab><enter>
./NV<tab><enter>
The chmod 0777 allows you to execute the file. The next line executes it. Allow it to automatically set everything up for you.
Then just do this to start the GUI:
startx