Adding a start up script at the start of a new game?

[Ghostman Gaming]

Hi,
Im currently working on a RPG game and was wondering
if it is possiable to have it so when the player starts a new game after the first map loads up for a diolog box to show up telling the player the basic controlls and the mission objective? the only example i can think of is on the FPS map experimental chambers.

[Ghostman Gaming]

[Hirato]

experimental chambers has a trigger-once trigger where the player spawns.

I can think of two ways to do this in the RPG.
1. use r_sleep to load up the dialogue - use a global variable check.
2. put it in the mapscript for the first map, under the the "load" signal - this signal is only executed when the map is loaded for the first time.