What happens next?

How to floor an attic
Call professionals to determine if your ceiling can carry the load.
You must make sure that your ceiling trusses will be able to handle the load of the new floor and the weight from storage or people walking around. Call contractors in your area and get multiple quotes for adding a floor.
This will give you an idea of whether you'll need to make structural changes before you can add the floor. Adding a new floor to weak attic trusses may interfere with the structural integrity of your house and can cause your ceiling to cave in.