Your report should be easy to read and understand. It should explain what is wrong, what are the implications, and who to contact to correct the issue. The report should have photos and illustrations to better help you understand the issue being addressed.
I use state of the art reporting software designed especially for home inspection. It is easy to navigate and will be delivered to you via a PDF, usually within 24 hours of the inspection.
Please, before you hire a home inspector, take a look at their sample report. This will give you an idea of how competent the inspector is.