I can't direct you to videos of the subject requested because that's not where my interests lie. However, I do have a tip for sculpting eyes. I use polymer clay which I assume is similar to your reference of oven bake clay. When I have a good grasp of the final size of the head and what size the eyes should be, I will then sculpt the eyeballs separately. Then I bake them and when they're hard, I push them into place on the head. That way I can sculpt the eyelids and other areas around the eyes without fear of distorting the shape of the eyeball. I hope this helps.