Unzip or unrar the bios files to the data folder.
You should have 2 files, one named dc_boot.bin and the other dc_flash.bin
We have the BIOS files available here:
http://www.epforums.org/local_links....p&id=2&catid=3
For your second question, read this:
http://forums.ngemu.com/nulldc-discu...i-imports.html