He means isometric (link), which is just a way of using 2D to represent 3D objects with no accounting for perspective.

If you could post whatever you've drawn so far I think we could give you some specific advice. If you reply and click the "Go Advanced" button and scroll down you'll see a button that says "Manage Attachments" which will let you upload your image. Apologies if you already knew that...but it's a little buried so sometimes new members don't see it right away.
M