Petrified wood

I am running a small business online now and i really do not want to do too much job one customer service. Can i use a help desk software? What is the best help desk online? How can i use it? Please help! I saw a free help desk software online last night, it is called iKode Helpdesk X, I want to buy it but i am not sure whether it works? Here is the website: http://www.phphelpdesk.org/, please give me some useful advise. Thank you very much!