Take a look at MOI (Moment of Inspiration). It's a simple but powerful 3D program that's easy to get started with. You buy it outright - no subscription required, and your models are your own, not up in a cloud somewhere. It's good for swoopy shapes like those lures, and once you've got a model you like you can run it through the CAM program of your choice to create G-code for your Tormach. https://computersculpture.com/moi