open the map up in a map maker.
save the map off into a BMP format.
edit the bmp in paint.
skew the image to 25% x 25% of original size.
lable up any cave entrances etc (if you want to).
resave BMP.
use HH8 or some other .wil editor to import the newly saved bmp into your mmap.wil file.
asign the mini map to the right map in the TBL_MAPINFO table on your database.

hope its simple enough to understand for you,
peace out
much love
Torni xxx