That is the general idea but you need a contractor or inspector to tell you exactly what is needed. A year or two ago I built a 540 square foot 2 level deck with 4 stairways. It is 20x28 feet in size and used about 5 tons of wood and over 5,000 screws. There is a lot of math involved in figuring out exactly how much weight you can put over a span of certain size made a certain way with certain lumber. A contractor or inspector should know this stuff and will be able to figure out exactly what size, amount and design you will need to properly support the weight.
It will likely be something similar to what is displayed above but you want to be absolutely certain. If that collapses it will likely take most of the ******** of the house with it so you really want to make sure it is done right