If your making something that is less than simple it will almost always pay you to do some kind of drawing the try to get things straight in your head before you commit to cutting expensive materials up.
This never replaces modelling things, or making mock ups in cheap simple materials but these come after the design work has been done on paper.
After all Paper and pencil are cheap.
Step 1: Sketching
Almost everyone can draw despite what they think or say, but most people don't, I believe because they feel that the end result isn't photo realistic (although it can be), - in maker world this level of realism isn't necessary only enough skill to be able to work out how things fit and what might work.
In general for most people sketching flat is easier and will do.
A side view, a top view and a front view will show you all round your design
If you can manage it, then a 3D view, (called isometric view,) will give most none engineering people a better idea of your object