I'd agree that if you paid more than $20, you got ripped off.
The stance looks fine to learn. Most people learn with front binding at ~15+ and rear at 3+ or 0. Make sure the stance width is comfortable for you as well. Provided you didn't spend too much, I'd say learning on a 20 year old board is just fine. When you're ready to make a $500-1000 commitment to the sport, you'll know more about what you're getting into.
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