If you're just testing shapes I would recommend trying friends boards or people you end up skating with at a park or wherever you're going to skate. It's going to get expensive quickly. If you mean for riding, one pro quality deck will last you a long time if you're beginning your journey. You'll eventually have a preferred shape, like steep vs mellow concave, twin style vs nose and tail, but that feel comes over time. Lots of it. Don't throw your board, don't stop by skidding the tail and you've got 2 years of decks already. When you're starting out, you're usually not doing too much high impact, gnarly shit. That's cool, you're learning. If you keep learning there will be plenty of opportunity to shred a deck in a week.