You have an detailed dimension drawing, so I do not see a problem.
Draw it according to the dimensions in 3D (inventor) - reverse engineering is easy is you know how to work the 3D program.
I am a designer, not a teacher...How can I help you to understand inventor??
Buy a book or follow a course to train yourselve in using inventor.
Why do you want to use inventor if you do not know how to work it???
I need your help
You can do it