Hi. Hope you have a wonderful trip.
When you go to the airport, you go to a counter for your airline to get your seating assignment or just check in if you already have your seating assignment. At that counter they tag any luggage you are not physically carrying on the plane with you and send it through to the luggage handlers who load it into the plane's belly.
I usually carry as little as i can get by with in my carry on. Tooth brush/tooth paste, brush, contact stuff, small makeup bag, something to sleep in, change of underwear.
There are lots of things that you are allowed to put in checked luggage that you cannot bring in your carry on - metal nail files, knives (even pin knives), cigerette lighters, check with the airline website for a full list. If they see them in your carry on when they xray it during boarding, they will remove them and most times you won't get them back.
I haven't been on a helecopter before - I bet that is fun.
Hope this helps.