[3D_Beginner]

1. How do you fill in a 2D hollow box?

2. Is there a detailed tutorial on curving objects?

3. When a model is rendered, is that the programming code that comes up?
(If so, what language?)

4. Is there a site that provides commercial quality textures for free?

4b. With the textures, is there any rules about selling the textures? (With my models)

Thanks for answering any/all of my Q's