Skyblock is a name for the type of maps where you supposed to survive on the small island in the sky. Original map is pretty tricky to finish for the average player, but you can load this newbie version, it provides much more resources from the beginning. Your main goals will be the same: to build yourself a house, cover need in food, reach the other islands and prosper in the first place.
How to install maps:
Download .mcworld file below
Open file using any file manager to import it into Minecraft PE
Open Minecraft Pocket Edition and look for the map among your worlds