You can't.
There's currently no way.
By holding your finger on the block you wish to mine.
Not yet
The next update should come out soon.
NPC villages are currently not in the code for generated structures in Minecraft: Pocket Editon. Therefore they cannot be generated in any seeds in the game, and are only able to be generated in worlds on the PC version.
No, villagers do not eat.
There are villagers in the full version of Minecraft and the Minecraft demo. However there are no villagers in the Classic version of Minecraft, but it is possible for a server to create AI controlled entities (which mostly just stand there).
u cannot breed villagers
Not yet
Villagers are never hostile towards you, unless they are zombies or you have a mod that causes villagers to attack you
Yes there is signs in Minecraft Pocket edition