By doing it
Well mainly by practicing each track on Time Trial. But if you want some shortcuts, I advise you go to Youtube.com and type in "Mario Kart Wii Shortcuts."
Get 'gold' in every race/challenge/level. Try for 'A' instead of C or D level within that 'gold' (as in win every single race in the game)
No. You need to get first. Doih!
you mean win a race without getting first? certainly not! who told you that? You can get first in a tournament however, with out getting first in every race. You just need the highest amount of points.
try to win all the races
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You have to get 1st on the 150cc cups. You do not have to win 1st every race in that particular cup. You have to win 1st in the points you have won. There is other characters that you can win from winning 1st in the cups. The Mii, However can be won in any level.
Nope but you can win a go kart by doing every go kart race at the carnival and town
maybe.
try to get rosalina or whatever her name is. you need to get at least 1 star in every single track in the game. i dont have her though. its kind of sad.
You need to win gold trophies in every cup on every mode.
If you need to unlock her in Mario kart wii here is the answer: Win the 150cc Special Cup. If you need to unlock her in Mario Kart 7 here is the answer: Win the 150cc Mushroom Cup. Source: I beat Mario Kart Wii, and I unlock Daisy in Mario Kart 7.