sketching

I have long wanted to learn how to properly sketch jewelry design ideas.  I have never been very good at traditional art (sketching, painting, etc.) and sadly my jewelry sketch book looks like nothing more than doodles.  Even more of a tragedy is that some ideas I "doodled" years ago are now lost in my inefficient way of capturing my ideas.  I've bought some books on the subject but get lost after the first couple of pages, which leads me to think I need to take a class or learn in a more visual way.  I can only wish that one day my jewelry sketches look like works of art on their own!