Haven't played it enough to have favorite missions themselves, but for a beginner to the game I like to select R2D2, Light Death Star Missions, then backhand left ramp three times to light endor, then hit right ramp to start hyperspace hurryup, and then hit death star to collect hurryup and start both Death Star III and Endor III, both of which seem like not too hard modes. Usually I can complete both at once, and then I've got two MBs set up