If you are enquiring about bags and go, you put your luggage outside your cabin as normal.
Then after disembarking the ship you collect your luggage in the luggage hall like every one else.
There will be a stand in the luggage hall to drop your luggage with the company. They will take your luggage in a van to the airport ready for you to collect later in the day. It is cheaper to pre-book this service.
You make your own way to the airport to collect your luggage and then get your flight home.
Give yourself time to collect your luggage, as from memory I think collection in this scenario is from left luggage in terminal 1.