I have fifa 98 for the n64 and i want to update some national teams. Where can i find a website where there is a list of national players and their attributes?

I don't know, but if you have a computer you can download FEd98 and my update from http://www.fifartwc.com .
First create a fake FIFA98 directory, install the patch, then just use FEd98 to see all the stats!