[Unknown123]

This Should Work (Not Tested)

pawn Код:

#define SPAWN_DIALOG 1

public OnPlayerSpawn(playerid)
{
    ShowPlayerDialog(playerid, SPAWN_DIALOG, DIALOG_STYLE_LIST, "Choose where you want to spawn","Las Venturas Airpost \nUnity station \nThe Docks","Select","Cancel");
    return 1;
}

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
    if(dialogid == SPAWN_DIALOG)
    {
        switch(listitem)
        {
            case 0: //Las venturas Airport
            {
                SetPlayerPos(playerid, X, Y, Z); //X, Y, Z Coordiantes to the airport
                ChooseSkin(playerid);
                return 1;
            }

            case 1: //Unity Station
            {
                SetPlayerPos(playerid, X, Y, Z); //X, Y, Z Coordiantes to the unity station
                ChooseSkin(playerid);
                return 1;
            }

            case 2: //The Docks
            {
                SetPlayerPos(playerid, X, Y, Z); //X, Y, Z Coordiantes to the docks
                ChooseSkin(playerid);
                return 1;
            }
        }
    }
    
    else if(dialogid == SPAWN_DIALOG+1)
    {
        switch(listitem)
        {
            case 0: //Skin 1
            {
                SetPlayerSkin(playerid, 1);
                return 1;
            }

            case 1: //Skin 2
            {
                SetPlayerSkin(playerid, 2);
                return 1;
            }

            case 2: //Skin 3
            {
                SetPlayerSkin(playerid, 3);
                return 1;
            }
        }
    }
    return 1;
}

stock ChooseSkin(playerid)
{
    ShowPlayerDialog(playerid, SPAWN_DIALOG+1, DIALOG_STYLE_LIST, "Choose your skin","Skin 1 \nSkin 2 \nSkin 3","Select","Cancel");
    return 1;
}

Maybe Helps:
ShowPlayerDialog
OnDialogResponse
SetPlayerPos
SetPlayerSkin