We've just put the finishing touches on a new CAD (Onshape) tutorial. It's the one I wish I had when I was learning years ago. There's a GIF at every step and it takes you from camera controls to a fully-functional model rocket in just a few hours. Take a look: http://stageoneeducation.com/cad-tutorial/index.html
We (RocketEd) are a company that has developed a set of new model rockets that build in seconds without tools. You can download them for free on our page here and you can download the accompanying curricula for free on our website! Please check us out and let us know what you think.