how do i play online? you need to connect your wii to your router
do i need friend codes? you will be assigned a friend code when you go online in a game for the first time
how do i add them? there will be a section, usually called 'Friend roster' in a game. this is where you can add people. You also have to give them your code too.
do i need origional game? no
is wired internet ok? yes, but you will need an accessory to connect the wire to the wii.