Full sets of cards, which are not wrapped in packs, are also delivered to card dealers. The goal of card collecting is to have fun. Which ones should you collect or how much you spend on them is up to you. Or the ugliest, funniest, or cards of players from their home teams. Decide for yourself how serious you want this hobby to be.
Some people are happy buying packs in a store and simply saving whatever they get.
Others visit local card dealers and go to shows to buy and trade. If you decide to get serious about it, then try to learn as much about the cards as you can. There are magazines about cards. Also ask a lot of questions and talk to other collectors. You have to figure out how much money you are willing to spend and then do not spend more than your budget.