public OnPlayerRequestClass(playerid, classid)
{
    switch (classid)
    {
        case 0: GameTextForPlayer(playerid,"fbi~n~san fierro",2000,5);
        case 1: GameTextForPlayer(playerid,"gangsta~n~los santos",2000,5);
        // etc etc
    }
    
    SetupPlayerForClassSelection(playerid);
    return 1;
}