Ahhhh, welcome to my world. My first knife drawing looks way mote like a blue whale than a knife.
I have done a few things to help learn to draw.
1. Buy a set of Ship's Curves. They are like French curves but are radiused to flow like a Ship's keel. Ships/boats cut through the water in a similar fashion as a knife cuts.
I also bought color pencils, protractor, compasses, scribes, a flexible curve , circle and oval templates, clear rulers,grid paper, a couple art pads.
2. Draw several copies of known proven designs. Get a feel for what people already thinks feels good.
3. Practice. Ford Hallam inspired me to learn to draw better. I thnk some people are born with talent, but, I think skills like drawing can be taught/learned. You will get back what you put in to the effort.
4. Opti-Visor.... For $35 or so, bring your drawing to hi def. If you are tracing or following a line the ability to see stuff under magnifacation can't be beaten. Once you get an opti-visor you'll soon be using it to do all sorts of tasks!!
5. Get comfortable.
Hope these things help. One of these days I'll post my blue whale picture. It'll make you feel better about your worst effort I assure you.