On the internet, search for various pictures of the many types of stage spaces. Find examples of proscenium, thrust, arena, and created and found spaces. Look, not only for modern stages, but for pictures or drawings of stages from as far back as the Ancient Greeks.
Visit the website for the National Theater of London at http://www.nt-online.org/?lid=21. This page will bring up the virtual tours of the many spaces at the National Theater. Take the virtual tours and explore the various types of theater spaces. Which one do you like the best?