Aside from the food aspects of things that Al has already covered.
Running a business from home, particularly if it involves callers or sales from home, could affect your home insurance, your mortgage company may have a say in it, and you may find yourself being assessed for business rates on part of your property.
Getting back to food, this may be of some help:
Your first steps at running a catering business.
I realise this is much more than Vic is intending, but I thought it might be of interest to folk.