I can tell you about the characters, and the plot, episode by episode. Now, you can find most of this information on the official Eastenders WebSite.
However, here, we can go much better. Whilst on the official Eastenders WebSite you can learn of the current characters, and read an episode by episode guide starting from 20 April 1998, here we will start from the beginning of the series, on Tuesday, 19 Februay 1985.