How to start with Arduino Pro Mini and USB to UART Serial Converter Module
Arduino is very popular within electronic hobbyist and robotics due to its simplicity.Freely you can download all the data of arduino from http://www.arduino.cc/Arduino software,The hardware reference designs and all the libraries are free to download from their site.
Arduino Pro Mini is a small version of Arduino. Original Arduino Pro Mini is about $18. Also you could buy one from ebay for lower prices.To program the board you need a USB to UART Serial Converter Module if you are going to program it using your laptop since modern laptops doesn't include any serial port.When you are ordering Arduino Pro Mini remember to order USB to UART Serial Converter Module which you can easily buy from ebay.