The best way to kill the Ender Dragon is to destroy the Ender Crystals that heal it (preferably with a bow or maybe snowballs as well since these crystals are on obsidian pillars), then focus your attention to killing the Ender Dragon. Make sure to have your bow enchanted with Infinity. If you're having problems getting the Ender Dragon close look away for a few seconds, it should come to you. Also the Ender Dragon can destroy any blocks apart from obsidian and End stone.
not
Kill the enderdragon.
Yes you can.
The enderdragon is on mineblocks 1.25 or you can get minecraft 2d from the chrome store (which im playing on right now)
In Vanilla Minecraft, this is not currently possible.
Although the main goal in Minecraft is to go to the End dimension and defeat the Enderdragon, it may be harder to create the Wither and defeat it. Once you defeat it, it will drop a Nether Star, which can be crafted into a beacon. If you make a pyramid of iron, gold, diamond, or emerald (or some of each), the beacon will give you special buffs. This is probably the hardest thing to do in Minecraft.
3 stacks
no, but you could get a mod where you can
The wither and the enderdragon are currently the only two bosses in Minecraft.
No, creeper dragons do not yet exist in Minecraft. The only type of dragon that currently exists is the Enderdragon.
An enderman is 3 blocks tall, and 1 block wide.
The ender dragon resets every server restart.