Storyboarding for beginners
I've always just envisioned the film in my mind and sketched out (on actual paper) the shot angles.

Another option is to get miniatures of your locations, props and performers (dolls, action figures, etc.), position them as they'll be in the scene, and take photos of each of the angles you want in your storyboard. Then you have actual photos of the angles you want.

A third option is similar to the second:  Use miniatures, and then use a video camera to do the actual movements you want.  Someone could be reading lines of dialog aloud while you are shooting.  I saw a documentary showing that this was done during preproduction of Return of the Jedi for the speeder bike sequence on the forest moon of Endor.

With the first two options, I would have the storyboard on set with me, and put a mark next to each shot I'd gotten. That way I knew what I had left to shoot.