Good! You are here because you wanted to use Arduino. 1st thing 1st, you will need the necessary tools to get started, and this guide is meant for Arduino Fio Arduino Main Board (There are plenty of Arduino main board
Arduino Pro Mini is a compact but powerful Arduino board. Being designed with the idea to minimize the cost, the on-board USB to UART chip is taken out. leaving the board with pure ATmega microcontroller, voltage regulator and reset button.