You've gotten all good advice so far.
I agree that aspen is a great substrate for hognose. I don't like aspen at all, all my other snakes get coco coir, but for burrowers like hognose aspen is my favorite.
I'd also follow Deborah's advice on starting with a small enclosure. Deb knows her stuff and won't steer you wrong.
Here's a photo dump of my boy Cosmo....
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