There are many tutorials online to help you learn software. Here are some links to help beginners learn new software.
AutoDesk Inventor
Check out these video tutorials
https://www.youtube.com/playlist?list=PL428287FEFDCCAE1D&feature=plcp
http://knowledge.autodesk.com/support/inventor-products/getting-started#?sort=score
AutoCad
3D Studio Max
Softplan
https://softplantuts.com/tutorials
https://www.youtube.com/results?search_query=softplan+12+beginner