I would suggest that you
a) Make sure your WiiKey has the latest 1.9s firmware loaded.
b) Get a copy of the Datel Freeloader disk
c) Make sure that any out of region games have been run through WiiBrickBlocker or similar to prevent firmware updates to your console which could render it useless.
There are not a lot of games out there which are not available in PAL format, so probably best to try to find the PAL copy instead if you can. Also you may want to have a look at this