@Ani61:
Take pictures and document all the damage. Put in a claim to the guests for the costs using the resolution center link at the top of the guest's message thread. This has to be done prior to the next guest's arrival. After 72 hours you can ask Airbnb to step in to assist if the guests have not paid (which they probably will not but this gets action started).
Make sure your house rules state "No parties." If your house rules did not state this or something else that the teens violated then you will have trouble. You have to spell out your rules for Airbnb to stand behind you.
Airbnb may or may not pay for your damages, some hosts have success while others, even with valid claims, do not. That is why it is best to have short term tenant insurance (not regular homeowner's insurance which will probably drop you if you file a claim with them).
So sorry that this was your first experience with Airbnb. We've been hosting for almost 4 years and have found that the vast majority of guests are good experiences.
To help you in the future:
1. Add house rules to your listing to deter parties, third party bookings, etc.
2. Install surveillence cameras to the home's exterior and include that in the listing.
3. Portray in the listing as well as the initial communications that someone will meet the guest at the home to provide keys and answer questions.