The business plan is going to walk you through all the pieces of the business. From licensing and regulation to identifying your competition creating a marketing plan and setting up your price structure. All those things will be necessary.
The Small Business Administration (SBA) has some great information on writing a business plan. There is a lot of other resources out there to help you write a business plan. You can also know how to start a catering business via https://www.alshanmarketing.com
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Also, you need to decide what kind of catering you want to be. There are various forms of catering. There is a catering company, and there is also a large segment of social catering involving the catering for the wedding. Often you find some catering only going to do the wedding.
Two things that are going to be vital in your business are your kitchen. You are going to need a kitchen to work out of and make sure to check with your state's health department regulations. Most states require you to work out of a licensed kitchen. A lot of equipment will also be required. This includes both cooking equipment and catering equipment.
You are also going to need a list of good recipes. These can be recipes of meals that you can cook good as well as those that you specialize in. You always want to be known for your food, so it is a very good idea that you perfect your food before you get started.