There are a variety of methods of connecting floor joists and roof trusses to a cmu wall. Your building plan should specify the method required in your area. Typically, roof trusses will be connected with hurricane hangers. (See pic below.)

If you are intending to make the blocks the final surface, waterproofing a single wythe masonry wall is difficult. Even high-tech spray-applied silicones and silanes will not stop water leaks through cracks and the mortar.

As well, blocks are much more difficult to work with than light framing. Especially if you're not used to heavy labour!

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Here is a link that might be useful: Durable Waterproofing for Concrete Masonry Walls

Any structural element not described in the building code text or tables should be designed by an engineer. The trusses should be designed by the fabricator's engineer. They would need to be lifted in place so for a small DIY house they might not be the best option. In a cold climate I insulate the rafters so that the attic will be a conditioned space for equipment and ducts and that would eliminate trusses. The HVAC system and the exterior wall and roof structure should be design so they work together.

I'm not sure what the energy efficiency advantage is of masonry. What is the climate?