These three progressive levels of scale exercises (6 patterns each) will help practice fluency in all keys.
I've crafted a 30-minute warm-up/fundamentals routine to help me capitalize on small blocks of practice time that crop up in my teaching schedule.
Bill Adam's Daily Routine, originally for trumpet, adapted for trombone
Drone pitches optimized for intonation practice with brass instruments
Free audio prompts for mouthpiece practice.
Exercises for three trombonists to practice intonation and blend