Hi Mike -
I don't have an iPad so I can't offer you a specific setup procedure, but I've linked this thread to our most recent GarageBand for iOS course -- maybe there'll be something helpful in there..
Here are two videos that go over recording audio -- the first is from the course linked above; the second is to the course for the video below, which also discusses recording with a USB mic..
https://www.macprovideo.com/video/garageband-for-ios-101-explained-and-explored/17-17-recording-audio?afid=E470KLQ7r9
https://www.macprovideo.com/video/garageband-ipad-mac-and-beyond/11-11-using-a-usb-microphone?afid=E470KLQ7r9
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