Here are some hints to get you started:
Search for hidden "Mickey 50 Ears" of all different sizes.
Be alert-- some icons are easy to spot, while others are a bit trickier.
Keep your eyes open while in attraction queues.
Spot your first 12 hidden "Mickey 50 Ears" icons on the golden lampposts that line Main Street, U.S.A.
The above "hint text" is copyright Walt Disney Company.