Trumpet and piano albums
ABRSM Trumpet/Cornet/Flugelhorn syllabus 2017-2020 for Grades 1 & 2.
If you can play just a few notes on the trumpet (or cornet), then you're ready for this book. Here are 15 imaginative little pieces specially composed for the absolute beginner, all of them with attractive piano accompaniments. The pieces are arranged progressively, so you can hear the step-by-step improvement in your playing as well as simply enjoying the music.
Really Easy Trumpet Book (with piano)