[DRIFT_HUNTER]

Try these for reserving slots

pawn Код:

//At top of the script (under includes or somewhere there)
new ConnectedPlayers;

OnGameModeExit()
{
    ConnectedPlayers = 0;
}

OnGameModeInit()
{
    ConnectedPlayers = 0;
}

OnPlayerConnect(playerid)
{
    ConnectedPlayers++;
    if(vip == 0 && ConnectedPlayers >= 18) // Replace  vip with your variable for vip
    {
     SendClientMessage(playerid,YOUR_COLOR,"You are kicked due to slot reservation");
     kick(playerid);
    }
} 

OnPlayerDisconnect(playerid,reason)
{
    ConnectedPlayers--;
}