AutoCAD Inventor :: Basic Workflow When Designing Products Around 3D Scan

I just downloaded my trial of inventor suite and before going through learning tutorials I want to find out the general work flow I need in order to see where to focus my attention during these 30 days.I need to be able to do mechanical part and assembly designs built around 3 scan files (mainly provided as .STL files).

1) take  the file and orient it to the project axis/plane

2) scale it if needed

3) design components around 3 scan characteristics

4) design modifications to 3D SCAN to accommodate designed components (such as bolean out pockets to house components within 3d scan features

5) modify surface of 3 scan to allow surfaces to flow into changes made in step 4

example:

-take 3d STL scan of a solid  screwdriver handle
-orient it to the inventor work planes and axis
-design a metal screwdriver bit based on the shape of the handles 3d scan
-design and boolean out a cavity to accommodate the metal bit
-place bit design within cavity

modify screwdriver handle surfaces to seamlessly flow onto the metal bit... what software would do what part of the process and if there is specific terminology what that is so that I can better search the knowledge base and Autodesk University?