Marketing Plan : There are many different catering niche markets. Before you start your marketing efforts it is important to have a good idea of your menus and the niches that you are targeting. Try to identify a gap in the market that is not being met by other caterers and go after it. Once you have a better idea of what you are selling you can then look at how you can sell it effectively. Start by packaging your offerings nicely into menus, brochures and a website. Then work out a system for pricing catering jobs profitably.
This is a much better plan indeed. However, a superior plan would take all of these ideas to the next level by planning for "what if": what will I do if I get a flat tire, if I run out of gas, if someone gets sick, or if I lose my wallet? You can see how the superior plan is clearly the best in most situations in that it allows for flexibility, plans for the expected and the unexpected, and allows you to spend more time enjoying the trip, knowing that you have all of your bases covered.
If your answer is no, you may have been able to easily accomplish this goal by planning for such expenses in advance through a business plan. Even if having cash at the ready is not a viable alternative for you, you may have planned to have a line of credit available for such opportunities, knowing that in your field these opportunities do arise from time to time.
Once you start your catering business it is important to continue to refer to your business plan to make sure that you remain on track to meet your goals. You can also make changes to it if necessary as your business develops.