I need it for necessary, in a tutorial explains every single step.
Personally, I don't have time to write a tutorial, but, your model has problems. None of the surfaces are trimmed together, nor are there any fillets. This causes major problems when machining complex surfaces, even if you have a 5-axis CNC.
What is the model to be machined from?
What is its end application (why do you want it)?
What machine type will it be machined on(make, model)?
What cutters/holders do you have?
I need any 3-axis machinig project to pass CADCAM course at university. it is only a theoritical project. you can use any cutter, holders, 3-axis machine.