Tulane University has put together a detailed description of the opening volleys of the Civil War. The site breaks the description down into nine specific parts that provide lengthy summaries as well as biographies while detailing decisions that were made and orders that were given both before and after the battle.
The most effective facet of this site are the calenders provided for each section. The calenders point out days in which events such as letters, missions, and reports that took place during the specific section. This sheer amount of information provided by Tulane is a great place to go if you want to know anything about the fort that started the Civil War.