This is a business that thrives on thorough planning and organization and many don't realize all the necesscary expenses. In the end, cooking the food is one small part of the whole event. The costs are enormous for a quality production but people are willing pay it if you can ease their tensions of hosting a party. Good advice is to not take on too much at first. Starting with fruit trays and other cold items is usually the first step.
Hot food is a different monster.
Also, you MUST find a reputable and well stocked rental company that delivers in your area. As far as food goes, it is pretty much the same as a restaurant. If possible and if the market will bear these costs, these are pretty standard guidelines. E-mail me if you have any specific questions. Thank you both for the replies.