How each scale is laid out
Each measure of the scale starts with a quarter note on beat one, then eighth notes, up and back down. The arpeggio follows in triplets, and the scale ends on a whole note. With 2 octaves on, a scale that would go past the range on this sheet is printed in one octave and marked "1 octave".
Keys with two names
D♭ and C♯ major sound the same, and so do G♭ and F♯, and B and C♭ (and their relative minors). Use the spelling buttons to print the one your music uses.
Practicing scales
Use a metronome. Start slow enough to play every note clean and in tune, and speed up only once you can play the scale twice in a row without a mistake. Say or think the note names as you play, and learn the valve fingerings with them, so both are automatic by the time the scale is fast.