You probably already know this and will cover it but:
No blank spaces. Either filled out or N/A with N/A=Not Applicable written in comments section.
Print not cursive.
Also, put something in the comment section that is relevant and that upon review 3 years from now will help you remember the incident.
And finally. Most Accident Report Forms are really confusing. Some of the better stations I have been through, everyone was given a blank form and as a group they fill the form out while asking the "patient" the questions, then go through them together and see how differently each person evaluated and transcribed the answers.
Good luck, this is a tough topic to make interesting.