Some of the Wii Games may need to be UNSCRAMBLED
If they're scrambled they'll be ".wii". If they're
already unscrambled they will be".iso",
then you can just burn.
If if you do come across
some which need unscrambled, download Rawdump
2 and select "Convert raw to .iso".
To burn I use ImgBurn. It's free, . You can Slow the burn speed down to a normal burning speed. The slower you burn a disk the better the copy will be (even if the disk says 32x speed and you burn at 8x there still could be lots of errors) Try different speeds and different disks to find what works best for your console.
WiiSO Wii & GameCube ISO's Download. you will need to register. It's FREE and well worth while