The first time I just used my lightsaber. If you wait for the shield to go down and use force speed you can slash 'em up a few times with fast style and pull back, or if you've got skillz you can try to roll stab them while using speed. Roll stab if used correctly can down a droid in a single hit. Lightsaber throw is harder to use but if you can keep the reticle on the droid a few throws later (when its shields aren't on of course) it'll drop eventually.
"Size matters not."-Yoda
"There is no emotion; there is peace. There is no ignorance; there is knowledge. There is no passion; there is serenity. There is no death; there is the Force"-the Jedi Code