I just found all my C's and I discovered that the ones on the left (the lower ones) make a "BLEEEH" sound, and the ones in the middle sound like circles, and the high ones make a "tng" sound and make my face scrunch up.  also they ring out more even when I lift up my finger.  I don't like that.  What's my next step?
go to the middle of the keyboard. take every white note from C to the next C. so that should be 8 notes (c, d, e, f, g, a, b, c). Now, see what songs you can play! just using those notes. hint: start with like popular kids songs