Advice: contact your LHS immediately (well asap anyway) about the cracked canopy, and check it over real well, I'd take pictures before I'd even take it out of the box.
Somebody owes you a new canopy, maybe a whole new helicopter.

As long as the adapter has a plug that fits the charger and has the correct polarity, you will be OK, the current draw is determined by the device ( the charger) not the power supply, as long as the power supply has the correct voltage.

If you do intend to fly it, charge the battery fully first, the electronics in the bird may get confused otherwise

But since it is damaged---talk to the store.