How much does a average wedding catering cost or how much should I charge for wedding food catering, I'm cooking myself? But don't know how much to charge?

So my friend has recently gotten engaged and are planning their wedding, its coming up really soon and they cant find a reasonable catering company, shes asked me to cook for her wedding which I feel I can and many other people have said I cook amazing food, I don't want to brag about the quality of my food however I'm not sure on what to charge, should it be per hour or per day or per food item??? Someone Please Help Me Out? via /r/food http://ift.tt/2tvAlUo