Hi,
You could look up some Rolemaster rules, as MERP is a cut down version of that system. This might help with non-Middle Earth specific stuff like spells >10th level etc, but not with effects of swords on wights etc...
On that one, think about what they are, how they function and who made them, then think about possible effects against them. Do they bleed? probably not, as they are spirits or similar things. Make the rules up! but write them down and stick to them, you dont want your players complaining that things worked differently last time!
Also check out the online MERP magazine listed on the legendgames links page (cant remember its name off hand) as it has some great resources.,
Hope this helps a little
Andy
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