When the ambient temp is not too cold, you can crank the engine for a bit with a good battery and build oil pressure at the gauge, but that really isn't a concern now. I'm assuming you have the 123 chassis book. there should be a section under 42 on how to adjust the E brake. You were correct to adjust the stars at the wheels to tight and then back off a bit. Then checck the pedal for 4 or 5 clicks. If it goes too far or is too hard to push, adjust the turn buckle under the car where the cables meet after you get some jack stands. This is MB procedure and if it doesn't work, you may have to remove a disc and check condition of the shoes.

Peter

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