A couple of years ago, I asked my good friend Avery for advice on sight-reading. Avery has touched on this a little in some of the previous episodes but I found an email he wrote me on sight-reading, and I wanted to share it with you.
Thirty-two Etudes for Trumpet or Cornet by Sigmund Hering
Etudes for Trumpet: Solo Series (Instructional) by William Vacchiano
Remember, just keep it slow, and use a metronome to practice. Break them down into like 8 bars at a time, and speed it up as you get more comfortable with it. Before you try to run it down the first time, look at for a minute, and try to recognize scale and arpeggio patters, and rhythms that you are not familiar with. Try signing them on beat before you attempt to play.