[wilko1995]

Ok this code is for your question #3, to set plate to admin name:

pawn Код:

public OnPlayerStateChange(playerid, newstate, oldstate)
{
    new n[MAX_PLAYER_NAME], veh;
    GetPlayerName(playerid, n, sizeof(n));
    veh = GetPlayerVehicleID(playerid);
    if(newstate == PLAYER_STATE_DRIVER)
    {
        if(playerdata[playerid][level] > 0)
        {
            SetVehicleNumberPlate(veh, n);
            return 1;
        }
    }

    return 1;
}

NOTE: Untested