Help replacing cranks on Bianchi Super SX

Hi-

Im new to wrenching on my bike, but doing my best and Im stumped.

I bought a Super SX with Exage groupset. The original pedals w/ plastic toe clips were broken and the left pedal was fused to the crank (tried 3 shops and ruined a few pedal wrenches). So I ordered a 50/34 Stonglight...