Mouthpiece Puller (image 1)
Various Grips (images 2-5)
Image 6
also see legendary jazz trumpeter Roy Eldridge's grip and embouchure here. (and listen to him play an A above double-C!)
Images 7-9
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Wedge Cushions to Help with Seated Posture
Checklist to Keep In Mind While Messing Around (printable PDF)
Long Tone Basics
try these with some of the free drone tracks