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Using getters and setters vs friend and others

Ch1156 (1999)
Ok so i have a game and im unsure of what to do here, I have been told that there are many different ways of approaching a problem with classes but im not sure which one is best, i dont even know what some of the ways do and why. When should i use public memebers vs private, frendship and getters and setters?

main.cpp

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#include <iostream>
#include "Player_Class.h"
#include "Weapon_Class.h"
#include "Prototypes.h"

using namespace std;

Player::Player(string PLAYERNAME, bool ISFIRSTSTARTUP): playerName(PLAYERNAME),
                                                        isFirstStartup(ISFIRSTSTARTUP)
{

}

Player::~Player()
{

}

int main()
{
    Player player("Default", false);
    Weapon weapon;

    SaveGame(player, weapon);

    return 0;
}


Player_Class.h

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#ifndef PLAYER_CLASS_H_INCLUDED
#define PLAYER_CLASS_H_INCLUDED

#include <string>

class Player
{
    public:
        Player(std::string PLAYERNAME, bool ISFIRSTSTARTUP);
        ~Player();

    private:
        std::string playerName;
        bool isFirstStartup;
};

#endif // PLAYER_CLASS_H_INCLUDED



prototypes.h

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#ifndef PROTOTYPES_H_INCLUDED
#define PROTOTYPES_H_INCLUDED

#include "Weapon_Class.h"

void CheckStartup(Player player, Weapon weapon);
void SaveGame(Player player, Weapon weapon);
void LoadGame(Player player, Weapon weapon);

#endif // PROTOTYPES_H_INCLUDED


GameSetup.cpp

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#include <iostream>
#include <fstream>
#include "Player_Class.h"
#include "Weapon_Class.h"

using namespace std;

void SaveGame(Player &player, Weapon &weapon)
{
    ofstream SaveFile;
    SaveFile.open("Data.txt");

    player.isFirstStartup = true;

    SaveFile << player.playerName << endl;
    SaveFile << player.isFirstStartup << endl;
}

void LoadGame(Player &player, Weapon &weapon)
{
    ifstream LoadFile;
    LoadFile.open("Data.txt");
}



Weapon_Class.h

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#ifndef WEAPON_CLASS_H_INCLUDED
#define WEAPON_CLASS_H_INCLUDED

#include <string>

class Weapon
{
    public:
        Weapon();
        ~Weapon();

    private:
        std::string weaponType;
        std::string ammunitionType;
        int ammunitionPrice;
};

#endif // WEAPON_CLASS_H_INCLUDED
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