A complete system to learn how to read music, its name is "Solfeo" here we start with just one note "Do".
If you can read Solfeo No. 1 you can read this one too. Let's keep practicing one single note, A whole note.
Now you can see only two notes, but is the same note, "Do" both are a whole note each. Each whole note last four counts.
You can see the difference in a whole note and a Half note. Half note has a little stem going up.
Notice that "Re" has no horizontal line, and "Do" has a little horizontal line across the note.
Once you can read and play one solfeo, move to the next, just make sure you can play it perfect.
Repetition is the key to success. Repeat the name of the notes many times to put them in your memory.
Don't forget to say the name of the notes out loud, it needs to be out loud, not in your mind.
As you can see, with only three notes there are many possibilities, here is another one of them.
Each solfeo can be play in any instrument. Specially this one. PLay the solfeo on time.
If you are playing a trumpet, or any Bb instrument, the music will not sound as your instrument.
For Bb instruments, you can still play along with the music, it will just sound off a little bit.