Learning how to read music is actually not that difficult. The first step in reading notes is to know what the notes are. In the picture below, these are some of the notes that you play for when you are playing an instrument.
The music notes keep going up, so starting from C going up, the next notes will be D, E, F, G, A. It only goes up to G for the farthest letter in the alphabet.
The second step is to know what the symbols are in music. Below are pictures of a list of symbols that are usually on sheet music.
The third step is to know how to count the notes. In the picture below, the music is showing you how to count the actual notes in the music.