Try this simple trick:
Place an invisible object near your start point. Give it a unique tag (for example, ""startingtext") and change it's name (this can be a single blank space if you like) and description to what you want visible in the text box ("In a world...").
Place a trigger near your start point that the PC will have to walk through within a few steps of starting. In the "on enter" event, add this script:
// Quick descriptive text box
// activated from a trigger
void main()
{
object oPC = GetEnteringObject();
object oText = GetNearestObjectByTag("startingtext");
AssignCommand(oPC, ClearAllActions());
DelayCommand(0.1, AssignCommand(oPC, ActionExamine(oText)));
}
Have fun.