How do I get back to my spawn point?
Craft yourself a compass using 4 iron ingots and 1 redstone.
A compass always points towards your spawn point (no matter if this is the world spawn or your bed)
(source: cursecdn.com)
Build a temporary house where you are and dig until you find red stone and iron. Then make a compass and destroy the tempory house. Follow the compass until you get back home.