Isometric sketching examples - freehand more can be found on pinterest, link below.
https://nz.pinterest.com/andycatch/line-illustrations-isometric/
You might choose to replicate the example or draw objects of your own.
This term we will be learning how to draw using one point perspective. Check out this step by step tutorial to see how.
http://www.instructables.com/id/How-To-Draw-A-Room-Using-One-Point-Perspective/