How’s this? Might be a good middle ground between “The FIRST ORDER is planning a muwhahaha doomsday device” and not mentioning their specific goals at all:

Episode VII
THE FORCE AWAKENS

Luke Skywalker has vanished. In his absence, the sinister FIRST ORDER has risen in secret from the ashes of the Empire, plotting their return to power.

Failing to convince the New Republic to combat this emerging threat, General Leia Organa gathers allies from the farthest reaches of the galaxy to form a covert RESISTANCE.

Desperate for her brother’s help, Leia has sent her most trusted pilot on a daring mission to Jakku, where a clue has been discovered to Luke’s whereabouts…