Hi there. I'm Yanka, a Professional Caterer.
I know this is a late reply but I believe this may be of help to others who are starting up a catering business.
Check this guide. This was what I used at that time I started out my business. It paid off and I am happy with my success now.
If your passion is about food, no wonder you'll be successful in catering business. Well who doesn't love to eat anyway? :) But yeah, it's good to start from small and franchising is an ideal one if you already want a business with name already.
Catering Business is the best business in all over the world because people loves eating quality food. If you providing the best to them so your business will grow fast because for marketing catering business viral marketing is really important because if one person like your food he will refer atleast five persons and then one will surely try you.