All the basics and a little bit more to get you started and feelin' fine in your tropical paradise (or possibly desolate nightmare world).
Welcome to the Planet GameCube Kyojin no Doshin Guide! This will help you figure out all the basics as well as the important nuances of life as a huge yellow giant, without giving too much away.
Anything you could learn from the instruction manual or in-game guide can be found here, plus more personal guidance (but no spoilers).