With the pic that @
BrothaZay posted , I'll give you your first lesson but before I do, I just wanna say to you and anyone else that wants to get into music, you can learn by ear if that suits you, but the best way is from doing it from the ground up with theory. You will understand more clearly and your music will be better overall because you will know the tools and how to utilize them instead of being limited to what you can play only "by ear."
What you see listed is called the "grand staff" and the notations for each note. The grand staff(for piano) is made up of the "treble clef" that will always be posted on top and the "bass clef" that is always posted on the bottom with their respective symbols posted at the beginning of each staff. Each staff has 5 lines and 4 spaces, each representing a note. The treble clef is also call the "G" clef with it's reference point being the second line on that staff(G note) and the bass clef is referred to as the "F" clef with it's reference point being the fourth line of that staff(F note), You can use these reference points to help remember and figure out which notes are which while learning. The bass is generally played with the left hand and the lead/melody is played with the right. Learn these notes and their placements thoroughly.
On the piano diagram, the notes are identified for you. "Middle C" is a very important note that needs to be identified. The easiest way to identify middle C is look for the manufacturer's name at the center of the piano. Middle C will always be the first note with set of 2 black keys above, as shown in the diagram. The note names will always be a variation of the first 7 letters of the alphabet(A,B,C,D,E,F & G) with some variations.
The piano keys(and notes in general)consist of whole tones and semi-tones. Movement from white key to another white key or black key to another black key is counted as a whole tones(or whole step) and movement from a white key to a black key or vice versa equals a semi-tone(or half-step). There are 2 white key exceptions..... from note E to F and from note B to C equals a half-step. The black keys are minor keys that have a particular name depending on your movement. When ascending, the notes are referred to by the corresponding note that's identified with a particular note is "sharped."(example.... the first black key above middle C is called C sharp or C#) Conversely, when descending, a black key is "flatted"(same note from the previous example would be called a D flat or Db). All of the black keys have 2 names. Enharmonic notes are notes that share the same tones but have a different name.
An octave is set of tones... Each set contains 8 tones. The specific tones make up a set is called a scale. There are many types of scales but the most basic scale is the natural major(or just major) scale. Listed on the diagram is the C Major scale. It consists of 6 whole steps, 2 half steps and no black keys. The major scale movement order is........
Whole(first note)-Whole-Whole-Half-Whole-Whole-Whole-Half
In every major scale notes 3 to 4 and 7 to 8 are half-steps(semi-tones). There are 12 major scales. Now you can play them all.