You can access the puzzle creation by writing the /lasers command.
Then place, for a first puzzle, a laser sender, a mirror support and a laser receiver.
The player will have to send the laser into the laser receiver to win.
You will have to place a mirror chest in order to let the player retrieve a mirror.
Victory conditions can be defined within the area configuration menu.
Example: The puzzle is won IF 1 laser receiver is activated.
You can also define the same condition within disappearing blocks in order to create a door that prevents players from leaving the puzzle until they won.
You can find information about all those features within the wiki:
http://wiki.lasers-enigma.eu/First_puzzle