As mentioned above jump shrugs are great so i will not repeat anything said already.
I wouldn't try and perform cleans with out an experienced coach. With my experience on the cleans ,the learning curve is too steep and the tendency to screw up is high. Try power snatches, much easier to learn and the same athletic carry over (well nearly) Work up from the hang position, mid thigh, knee level, shin and ground.
Crossfit's website offers great videos to help on Olympic lifts and some great coaching tips.
Are a must watch
YouTube - Olympic Weightlifting Technique Vid-(2 of 2)
YouTube - Olympic Weightlifting Technique Vid-(1 of 2)