Get your ruler and image so you can create a grid.
Determine the even amount of length and start making marks at every point. Mine is 1 inch x 1 inch. Then connect your marks vertically.
Then do lines do your horizontal lines.
So now you have your grid.
You can choose to enlarge your image. I just traced mine on the paper.
Now you are ready to begin drawing the image onto paper.
These are the "forcausers" as I like to call them. And all they are is four pieces of semi thick, straight paper. Take two, make a right angle, and staple them together. Repeat that step. And WALA!
Just close it in a square to help you focus on it. Now sketch that onto the same square on your paper.
Just keep going one square at a time.
Hope this helps you make a good drawing!