Need help with how to save data to a world!

Hi, I need some help with the mod that im making,

I am making a Team system mod for my serrver, and i want it to make a team and save it to the servers world.

I'm still a beginner with writing mods, so i read the docs, but those were quite unclear for me....

Here is whatt i have:

Team.java

package austizz.ultimate_team_mod;

import net.minecraft.world.entity.player.Player;

import java.util.List;
import java.util.UUID;

public class Team {
private UUID id;
private String teamName;
private Player teamLeader;
private List<Player> teamMembers;
private List<UUID> teamEnemy;
private List<UUID> teamAlly;


public Team(String teamName, Player teamLeader, List <Player> teamMembers, List<UUID> teamEnemy, List<UUID> teamAlly) {
this.id = UUID.randomUUID();
this.teamName = teamName;
this.teamLeader = teamLeader;
this.teamMembers = teamMembers;
this.teamEnemy = teamEnemy;
this.teamAlly = teamAlly;
}

public UUID getId() {
return id;
}
public String getTeamName() {
return teamName;
}

public Player getTeamLeader() {
return teamLeader;
}

public List<Player> getTeamMembers() {
return teamMembers;
}

public List<UUID> getTeamEnemy() {
return teamEnemy;
}

public List<UUID> getTeamAlly() {
return teamAlly;
}
}

SaveData.java

package austizz.ultimate_team_mod;

import net.minecraft.nbt.CompoundTag;
import net.minecraft.world.entity.player.Player;

import java.util.List;
import java.util.UUID;

public class SaveData {

public Team create(String teamName, Player teamLeader, List <Player> teamMembers, List <UUID> teamEnemy, List <UUID> teamAlly) {
return new Team( teamName, teamLeader, teamMembers, teamEnemy, teamAlly);
}

public Team load(CompoundTag tag) {
Team data = this.create();
// Load saved data
return data;
}

// In some method within the class
Team.computeIfAbsent(this::load, this::create, "example");
}