I used to be clueless in this area too
First, see if the rar’s exist, find the folder they should be in (not using imgburn, just find the folder). If the rar’s really aren’t on your computer at all, you may have to find another torrent. If they are on your computer, and you just aren’t able to see them through imgburn, unpacking them is simple. To do so, you’ll have to get a program to unpack them, since windows alone is unable to unzip rar files.
There are lots of choices, but I recomend ExtractNow, since it’s free, small in size, and it has a simple interface. Once you have it installed, look at the file extentions of the rar’s. Do they all end in “.rar”, or are they numberd (.r00, .r01, .r02…)? If they all end in “.rar”, highlight them all, drag them onto ExtractNow, and click extract. If they are numbered, just click and drag the first one (.r00) to ExtractNow and click extract. Then ExtractNow will unpack all the numbered files.
The time it takes depends on size, of course, but it shouldn’t take long at all. If the extraction fails, then the files may be broken, which would also mean you would need to get a new torrent. If it finishes, the results may differ depending on whether the files had “.rar” extentions or numbered extentions. I’m not experienced with multiple “.rar” extentions, so I’m not entirely sure what the result would be (I’m at leat pretty sure a folder will be created). Really, for big packs, “.rar” is inferior to numbered files anyway. If the files were numbered, then after the extraction, there should be one new folder, containg the file for the game.
That folder should contain the wii game (probably in .iso format). Like I said before, I don’t think a Wii can read regular discs, but I’m not entirely sure. Hope I’ve helped.
Also, if you were able to open a torrent and download the files, there isn’t to much more you need to know about torrents (Except for safety issues, like viruses and such).