help how to do it exactly according to the drawing

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 could recommend a good school for you.

and by the way if it wasnt you who did the models in your profile. then were did you get them?

I need your help

You can do it