Generally you build a temporary stud wall in from the exterior wall to temporarily carry the load. This wall would have the ceiling joists resting on it.
You would really need to understand the house's structure before you under took the project.
Post pictures of the wall inside and out and the ceiling joists above.
Ron
You would really need to understand the house's structure before you under took the project.
Post pictures of the wall inside and out and the ceiling joists above.
Ron