Piano keyboard layout.
Don't be intimidated by the length of your piano keyboard, it's a lot easier than it seems. Take a look at the keys, notice a repeating pattern? There are sets of two black keys and three black keys; these are called accidentals and you will use them to find other notes (ultimately without this pattern it would be almost impossible to keep the white keys apart). Now, you can find the most crucial note on the keyboard: the C.
Finding the C note on your piano
As a pianist, your life is going to revolve around C, so let's introduce you. The C note is always the white key just before the two black keys. This is the same throughout the piano keyboard, the pattern repeats easily. Try it: Find and play every C on your keyboard using the coincidences as your guide.