Be absolutely sure you have everything in your carry-on that you would need for 48 hours after arrival. The chances of your checked luggage being delayed are quite high. Be sure you have your itinerary in an unlocked pocket of your bags, with name, address, and phone number of your onward hotel.

You will just have to go with the flow when you get to LAX. Know the layout of the airport and which terminal your onward flight will be in. Others here will have done this connection and can advise you of any particular tips on getting to DL. I've had problems with the inter-terminal buses before and always walk now unless I have a long connection with lots of time to use the bus.

It looks like DL has lots of connecting flights to MCO, but they sure take a lot longer than the non-stop you're booked on. Ask for help from the FAs if your inbound flight is late, ground agents will have a list of connecting passengers and should meet your flight.