Wii online multiplayer is not yet released so what you ask is impossible at the moment.
Now that said brace yourself for about 1-3 "use search function" posts. =)
Oh allmost missed Mii parade. To keep it shor you noticed that Mingle option in your Mii creator right. So Mii parade gathers Miis from other people that are in your friends list! So those miis with mingle option on from your friends will create a mii parade on your wii. Note your own miis won't show up in there.