Make Arduino UNO and Arduino Esplora communicate

Hi everyone!!! I was searching for a way to make Arduino UNO and Arduino Esplora communicate using the serial ports.
I need a "guide" to start from zero because I never connected any Arduino to another Arduino so...
Just a pair of requests:

  • I'd like to use as little pins as possible (idk if it's correct in english)
  • I'd like to NOT USE the tinker kits on the Arduino Esplora because I don't have adapters. Please use the female pins that are near the four buttons place
  • I'd like to send informations FROM Esplora TO UNO (esplora -> UNO)
  • I would appreciate the way with wires and the way via Bluetooth (for now it's more useful the way with wires because I don't have any hardware for the bluetooth)
  • I would like to know which are the best components to let the two boards communicate via bluetooth
  • I'd like to send a quite big amount of informations using as little pins as possible

If you can, don't send me external links because it's so difficult to link them all together. Sorry if I have so many request, and thanks for the answers.
I hope that you can add to your answer images of the boards themselves with the all stuff (wires etc) and also the code. Thank you!!!

Edit: I don't need the bluetooth way for now