From savannah biome, go straight ahead through the lengthy flat landscape and after a while you will reach to a village. But before reach to the village you will see a tunnel leading down to the cave,the cave found beginning of the village.
Minecraft PE Seed: novillageatspawn – Flat Landscape
After spawn the first things you will seen is a large grass landscape open field. A little farther, close the grass landscape field is a incredibly flat savannah field. Of course in the savannah field you can find some mountains in there, but mostly part of savannah biome is flat.
Seeds : novillageatspawn Work in PE ver0.9.0+ or ver0.9.5