Want to know batman and superman's whole story - where to start?

I'd like to know the whole story for both, where should I start and what series should I read?Want to know batman and superman's whole story - where to start?To get a basic background on the character you should read Showcase. It is basically a grouping of many comics together. If you can get the first volumes for each of the characters it would give you a background on who they are, what they do, etc. From there you can work your way up to modern stories.