We get this question a lot: How do I write a business plan for...?. The short answer is that the general structure of a business plan does not change regardless of the type of business you are writing a plan for. You should be able to use all the advice and information found right here on Bplans.com to get a pretty good idea of what a business plan looks like and what should be included. I recommend that you start at our “How to write a business plan” page here:
And, of course, check out our library of free sample business plans:
To your specific questions, as you develop your business plan, you can approach each service you offer individually within the same plan, or "keep them all under one umbrella" as you suggested. The umbrella may be Event/Conference Planning and the individual services would be things such as photography, consultancy, staffing, etc. You can then forecast each of these services individually. That approach will also allow you to test certain assumptions to see how they impact your eventual success. For example, if you increase the number of clients who also ask for photography services, how does this impact your overall revenue expectations?
Good luck with your business!
[Editorial note: We do try to avoid making sales pitches, but this question is exactly why Business Plan Pro was developed and is the market leader. We now also offer LivePlan, an online business planning solution to help you plan and succeed. You can learn more about our products at http://www.PaloAlto.com]