Hi, These type relay boards are easy to use. See this page of the ArduinoInfo.Info WIKI:
http://arduino-info.wikispaces.com/ArduinoPower (For general Arduino Power information)
and specifically
http://arduino-info.wikispaces.com/ArduinoPower#4-8 About this type board, and the Active-Low question)
Example code there shows how to utilize the Active-low property to guarantee no relays are activated at power-up or Reset until you want them to.