Here are 3 tutorial to get you started with inventor.
The project is to model a star ship that can then be printed on a 3D printer.
[youtube]https://youtu.be/piZHmQpugRU[/youtube]
[youtube]https://youtu.be/iNpWD75P2ws[/youtube]
[youtube]https://youtu.be/BBaq6uybeIM[/youtube]