get creative with simple exercises from the Arban's book Just another way to practice the exercises made of crochets at the beginning section of your Arban book. Couple of recommendations: 1. Be very diligent and careful with articulations (delicate but yet pointed tonguing). 2. Play every exercise in one breath, if possible. A short demonstration of mine: If you want to get even more creative, you can permutate this exercise in other scales, such as minor, diminished and aug
This is directed to anyone who starts on a brass instrument without being able to read music.
You would be better off and will have more options if you learn at least to recognize notes on treble clef, their duration, the cycles of fourth and fifths (which helps us to find out what key the piece/exercise is in and how many and which one sharps or flats every key has) and memorize fingerings for every key.
Not having a private Instructor or not being able to afford one is