no
Uh, ya there no levers in minecraft pe....
You use redstone things like levers/buttons/pressure plates.
no
you have to buy it
This is not the place to find out about Minecraft. Look at the Minecraft Wiki to find out about the game in general.
The best place to look is on the minecraft forums
There is no other LEGAL place to buy Minecraft.
same place as everywhere else from the minecraft website
Place the world in your minecraft bin's saves folder.
You have to buy it at minecraft.net
Minecraft.net is the best place.