Grab some from your backyard, let them live for a generation or two in their own terrarium to ensure no residual pesticides / parasites, and there ya go.
The tiny hopping things are more than likely springtails. Pinhead crickets are very obvious that they are crickets (the legs and the antennae are dead giveaways).
If your emperor scorpion stops eating, don't panic.
Be nice -- you were a noob once, too
"Never ask an engineer to explain something, because he will."