There are two ways. The first is to choose from your own echelon. Every Super League team has its own echelon of all ages, and the players in these echelons generally don't have high-paying contracts, which means they generally don't get much money, but they can't leave the team casually. They are also young and have a lot of room for growth. With the growth of age, if the skills meet the requirements, they will be upgraded step by step until the first team. After entering the first team, the team will re-sign with them, and the salary of this contract will be very high. If you don't meet the requirements with your age, you will be eliminated by the team. Generally, if such eliminated players have no other specialties, their lives will be greatly affected, and it is difficult for them to have better development prospects in society. The second is to buy in the transfer market. Find players who meet their own team building goals in the first teams of other teams and negotiate to buy them.