Two-Wire Peripheral Expansion for the AT89C2051 Microcontrol

Hi,

Anyone can help/guide me how to use Two-Wire Protocol (I2C). I already had understood the basic I2C working. So how am i to start from basic. I hope to control ADC, IOExpanded, RTC, EEPROM, RAM module.

Please help me from basic because i also in beginner state!!!

Thank You