If you haven't already read it, I recommend checking out All About Sound.
In a simple linear script, like part of a cutscene, playing sounds in sequence is straightforward with sleep["play"]:
play["sound1"] # do anything else you want while the sound is playing... # ... sleep["play"] # wait for all playing sounds (sound1) to finish play["sound2"]
In more elaborate cases, with sounds playing while a deck remains interactive, you may want to rely upon the loop[] event or keep track of your own timer to trigger subsequent sound effects.
Does this help point you in the right direction?