Notify the property owner, property manager or anyone else you believe may be responsible for the location. Request that an accident or incident report be prepared and ask for a copy. Do not be alarmed if you are told you are not entitled to a copy. In cases of serious injuries, consider notifying the police and/or contacting emergency response personnel.
If you are able, consider taking photos of the accident scene especially if you were caused to fall by a transient condition (e.g. snow, ice, water or other substance).
Consider preserving the footwear you had on at the time the accident.
Consider securing the names, addresses and phone numbers of any witnesses or good Samaritans who come to your assistance. Do not assume any responding police officers or emergency response personnel will get their information.
Do not assume your medical bills will be paid for by the property owner or its insurance company. Prepare to pay for medical expenses as you normally would. Keep copies of any receipts, bills, etc. documenting your out of pocket medical expenses.