You're good to go
If you got the wiikey 2, you don't need anything else. As said before, make sure you go throught the config disk and if you got a NTSC I would only allow upgrade from US game, absolutely no others.
If you still fell not confortable with that, you can turn off all updates but you might run into problem where some games will require updates to play, then you will have to get some other options to play those games.
Just stick to the Wiikey and allow US updates until you're more familiar with the other options but in reality as long as you got good backups and good burns than you're good to go.
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