[Catalyst-]

Just do this...

pawn Код:

public OnPlayerConnect(playerid)
{
    new string[32], name[24];
    GetPlayerName(playerid, name, 24);
    format(string,sizeof(string), "%s.ini", name); // You will need to change this to your accounts
    if(dini_Exists(string) && dini_Int(string, "Updated") != 1)
    {
        dini_IntSet(string, "Level", 0);
        dini_IntSet(string, "Updated", 1);
    }
    return 1;
}

Now, the first time everyone connects, their level will be reset to 0.