| Allen Vizzutti has some AWESOME exercises in his Trumpet Method - Book 1, pages 78 - 119. I highly recommend the entire Method (3 books)!
Multiple tonguing utilizes two principles, both of which involve the "release" of air to start the note. One note is released by the tongue, the other is released by the throat (like a cough), which in reality still involves the tongue. It needs to be perceived as being "forward", and the "flow" of the airstream is very important. (I'm sure that's exactly what Buzz is talking about, when she says use PLENTY of air.)
Keep at it... you'll get there!
Best always,
Bruce |