In Michigan there is the Dept. of Agriculture which can help you with it and also Michigan State University has a program that you can give your recipe to and pay like $100 per recipe for a nutritional breakdown. They then send you this information and you make the labels from there. I don't know where you live, but you can try using this information as a starting point.
The other thing I've noticed is many cake/cookie retailers (like us) will simply have a business card size sticker or printed on a business card the ingredients of the cake. I got a box of brownies from Manhattan Fruitier once and they had on a business card size card just the ingredients, no nutritional information. Hope that helps some! 
This is a website that is in my health dept. paperwork, I don't know if it will help or not
http://ts.nist.gov/ts/htdocs/230/235/h130-01.htm
Luckily in VA unless you are a much bigger company than I will be you only have to have a label with ingredients and not the nutritional facts.
Kristin
If you are in Ohio, you don't have to put the nutrtional facts, just the ingredients and how much it weighs, etc., unless you are claiming that they are fat-free, nutritious, etc.
So where are ya by the way? LOL!
http://www.ohioagriculture.gov/pubs/divs/food/curr/cottage/food-cottageindex.stm#tag1
if you want to wholesale you need that label. There are programs out there but the lic. is very expensive.
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