For White, the Ruy Lopez is your `e4` opening.  It allows for rapid development, early castling, and a nice tactical game.  For your `d` opening, a good ole Queens Gambit is hard to beat.

You'll also need to learn 2 openings for the Black side.  I like a King's Indian in response to `1. d4` and a Robatsch for `1. e4`.

They're all good in the beginning, however, so read up on some and learn the points of a few openings.  Try them to see if you enjoy the positions that result.

There's really no such thing as a simple opening in chess.  All are loaded with gotchas or nasty traps, ready to snare the complacent.