The good thing bout the London System for black is that he can choose a plan that suits his style and/or matches his repertoire ( if one has a repertoire yet)
For me since I'm a Nimzo and Queen Indian player I like the set ups with Nf6, e6, b6, Bb7, 0-0, and depending on the move order c5 or d5.
But it's much more about general themes then knowing moves by heart.