You need to kill lots of endermen and get their ender pearls. Then, go to the Nether and kill some blazes. Make the blaze rods into blaze powder. CRaft them together to make eyes of ender. Throw them in the air and follow them until they go down and keep going down when you throw them again straqight away. Dig down but be careful - you might end up in the lava! To get to the end, fill the slots with Eyes of Ender and jump in. Beware of the Ender Dragon!
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You don't. The Bats will slowly drive you mad until you are forced to build a new fortress.
Nether fortresses are pretty rare. You just have to keep on looking. Please give me a trust point.
There is not an End Castle in minecraft, the End is basically only to fight the Ender Dragon. But maybe we will see a Ender Castle in further updates.
There are 2 portals you can craft in Minecraft. The Nether Portal and The End Portal.
You cant yet Minecraft Xbox 360 edition hasn't received the update where you can go into the end but I believe it will be coming soon.