You have to redeem them in the system sectors on Destiny Islands in Questploration. Some may not be available at first. You have to unlock all the levels of Scan in the stat matrix to see all the system sectors.
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There are no codes for Kingdom Hearts 2.
you have to get right under it and then jump
You have to jump and glide into it.
Yes, monstro is in kingdom hearts, and he can be really confusing. just go in the door that riku went through (watch the cutscene) and everything else is pretty straight forward, just don't try and jump any gaps.
In kingdom hearts 358/2 days you must obtain the glide panel and insert it one of your slots. After that you have to leave the castle and then you jump and hold down Y