The first thing to know is the basic knowlege in graphical interpretation and basic engineering drawing. This will assist you to start using the software.
The first stage to learn is part drawing follow by the assembly drawing.
Last to present your design in various forms of standard in Engineering drawing is the last stage that is called "drawing" in SolidWorks. Here the size of paper, scale, title block, etc. are selected.
Also, tutorial videos and reading documents are of great additional advantage. You can contact me when you encounter challenges.