>>89724892There is no guide you can follow, nor any response from these people that will help you as if they were a guide. The best advice you can have is to visualize what you want to draw in a 3D scenario as if it were right in front of you. Think of the old Disney 80s era: pick the idea, take the concept, and imagine the scene as an event in your everyday life. Have someone or use references to visualize how it would work in real life, then transpose all those elements into a single thing. Once you have that in your own two eyes, put the image down on paper.
A simple thing they tell you to do is to "imagine a cylinder, imagine you are holding it in your hand, imagine the grip, the shape, the length, and size." Once you can do that, you can put it down on paper.