The major pattern varieties issued are described here:

http://www.webenglish.com.tw/encyclopedia/en/wikipedia/f/fl/flags_of_the_confederate_states_of_america.html

To understand existing varieties of existing battleflags, you'll need to to do further study.

Below is a well-known painting by Conrad Wise Chapman of the 'Stainless Banner' flying over the ruins of Fort Sumter in Charleston Harbor.