In Dexter's diner pick someone with a lightsaber and walk around and kill droids and people with guns that you bought. (or used cheats either way) and if your a sith kill jedi also it's something fun to do.
You will need to have completed the superkit. To do this you must fill your stud bar in each of the 17 levels. This will allow you to unlock the seceret level which is episode IV a new hope. This level is short but is filled with studs. You may be able to collect more than 120,000 from just one trip in. This will also allow you to unlock Darth Vader and to buy Princess Leia and a rebel solider.