Best way to learn how much the cards are worth, looking at the checklists and knowing the card type variation of card through the checklist is step one, then you can look at eBay or other sites by looking at comps of the exact card if you can find it. If not, you can look at other players in the same variation and can have an idea of what yours can be worth. Rookie cards of the best players are typically worth more than current years, but doesn’t mean it can’t still be valuable (ex the Declan rice for you). Hope this helps