new Text:yourtext; //anywhere up in your script

public OnGameModeInit()
{
    yourtext = TextDrawCreate(X,Y,"Text here"); // under ongamemode in it, change the text to your textdraw's text and change the X and Y to the coordinates that your textdraw has
    return 1;
}

//Now to show it to a player,you must use this under the command or the thing that you want it to show at, i will show you under onplayerconnect 

public OnPlayerConnect(playerid)
{
    TextDrawShowForPlayer(playerid,yourtext);
}