Here is a simple house and garden in Minecraft Pocket Edition.
Step 1: Location and Building
Find an open body of water, then go down and build a pillar to build off of.
Build a 10 by 10 square for the base.
Destroy your pillar.
Step 2: House and Garden
On your base, build a 5 by 5 house that is 3 blocks high. Put a door and decorate.
Put a Spruce fence in and a gate.
Hoe the ground
Alternate between tulips and seeds.
You are done