Use this interactive fingering chart to find where to place your fingers for each note on your instrument.
You can also use the fingering chart at the back of your book.
Ear Master gives you examples of melodies you already know to familiarize yourself with different intervals.
teoría is an aural skills program that helps you practice your listening and dictation. You can practice everything from writing bass lines to complex melodic and harmonic dictation.
Theta Music Trainer has tons of games and lessons to learn about interval training.