Since I posted it for my Sith deck, here's a more detailed breakdown of why I picked these sets. I do want to mention that I found LS deck building much harder… there are just a few more demands on the deck for what it needs to do. At least at first glance it would seem that a DS deck can play defensive and be fine while a LS deck pretty much has to attack, but still needs to defend.
A Hero's Journey - I think that Luke Skywalker is one of the best if not the best LS unit right now. The lightsaber and Trust Your Feelings will combo will with Yoda or Luke. Plus, the objective gives 2 resources itself and provides another resource producing card.
A Journey to Dagobah - Another double resource objective. Red 5, Double Strike, and Target of Opportunity all make for an aggressive set.
In You Must Go - Yoda loves to see enhancements. Unfortunately, only one is included in the set with him, but a couple from A Hero's Journey work pretty well. Shii-Cho training is sick on Luke or a souped-up Yoda. Counter-Stroke is nice whether countering or used in an edge battle.
The Defense of Yavin 4 - The deck ends up having a pretty good number of vehicles with 2 copies each of Red 5, Red 2, and Home One as well as 4 Y-Wings. The cost reduction ability of the objective can be useful in a pinch. Rebel Assault gives the deck some reach in case it can't punch through the DS defenses.
The Rebel Fleet - Home One is everything the LS needs in an attacking unit. Two unit damage, two objective damage, and a couple of bonus points of objective damage. Two more Y-Wings as well will allow the LS to hit objectives hard and fast.
The basic goal of the deck is to come out of the gates swinging and put a ton of early pressure on the DS player. If at all possible, Luke should not be commited to the force so that he can manage both offense and defense. There's plenty of resource generation available in the different sets so you shouldn't have much trouble playing out as much of your hand as you want each turn most of the time.