If the manual looks good, then the students feel good about the course. Make sure that it is clean, clear and uncluttered. It helps to have lots of white space on the page. The text itself should explain the subject matter in simple terms. Explanations should be adequate but should not include unnecessary information.
Many training manuals written by experts are too complicated and fail to explain the basic concepts.
For example, if you are teaching an introductory course in Excel, don't forget to tell the students what a spreadsheet is. Revision exercises, questions and summaries are important too because they allow both the student and the instructor to find out how well the material has been absorbed. Typically, these are located at the end of each lesson and at the end of each day of training. At each stage in the development of the course, you should check back with your students to ensure that it is going to satisfy their needs. Remember too that the training process does not finish when the students leave the classroom.