Get nodemcu running on your ESP8266, and confirm access via ESPlorer. There's a nice how-to at http://www.esp8266.com/wiki/doku.php?id=loading_firmware

Wire up the display to the ESP-12e:

Connect the following ESP pins to the OLED pins.

Load the following code to the ESP and run:

-- OLED Display demo
-- March, 2016 
-- @kayakpete | pete@hoffswell.com
-- Hardware: 
--   ESP-12E Devkit
--   4 pin I2C OLED 128x64 Display Module
-- Connections:
--   ESP  --  OLED
--   3v3  --  VCC
--   GND  --  GND
--   D1   --  SDA
--   D2   --  SCL

-- Variables 
sda = 1 -- SDA Pin
scl = 2 -- SCL Pin

function init_OLED(sda,scl) --Set up the u8glib lib
     sla = 0x3C
     i2c.setup(0, sda, scl, i2c.SLOW)
     disp = u8g.ssd1306_128x64_i2c(sla)
     disp:setFont(u8g.font_6x10)
     disp:setFontRefHeightExtendedText()
     disp:setDefaultForegroundColor()
     disp:setFontPosTop()
     --disp:setRot180()           -- Rotate Display if needed
end

function print_OLED()
   disp:firstPage()
   repeat
     disp:drawFrame(2,2,126,62)
     disp:drawStr(5, 10, str1)
     disp:drawStr(5, 20, str2)
     disp:drawCircle(18, 47, 14)
   until disp:nextPage() == false
   
end

-- Main Program 
str1="    Hello World!!"
str2="     @kayakpete"
init_OLED(sda,scl)
print_OLED() 

Have a beer.