I've written brochures on everything from charter airlines, marine surveyors, and printing companies to national parks, reading programs, statistical software, and computers. Some are lush, 4-color pieces for large corporations. Others are simple, two-sided letterfolds for those who have to stay within a small budget.
No matter what the project, the process is always the same - ask loads of questions, define audiences, clarify objectives - and only then start looking for a creative approach that gives the client the most impact for the dollar.