How do I get to Luigi's picture to rescue him do I need a certain amount..

First thing, scroll down to check if your question may have been answered, because it has been answered alot of times.

To get to luigi you need to pass the first big star door. I'm not going to write down my big chunk of writing again so scroll down to find out the luigi bit. Wario can be found after the secound big star door. To get him you will need luigi. Go to mirror room, take a flower off the pedastool and go through the mirror and into Wario's picture.

Yes I ahve lauigi but how do you open the white door and how do you get peach

Glitch:
Search for a bob-omb in a random level where there is one of them take him run then jump throw but you have to catch him when he's exploding so yuo have to be fast but don't worry if you didn't caught him you can quit the level or go somewhere far from him and the return so if you caht him just wait and after that he will get invisible go search for a coin. When you get a coin there are stars that fall off but this time when you get the money turn mario and he will be holding the stars and you can do it with somthing else like the balls in the mountain or a goomba...