If you have been injured in an accident, it is generally best to contact a lawyer for legal advice as soon as it is practical for you to do so.
You will need to contact the relevant insurance companies. This is best handled by a personal injury lawyer.
There are also some time restrictions to observe for making compensation claims. In Alberta, you generally have two years from the time of the accident/injury to make a claim. If your injuries only become evident later, you have two years from the date that the injuries are known.
Failure to claim within this timeframe can result in the loss of your right to make a claim and delays may prejudice any claim that you do make.
In some cases, such as those involving negligence on the part of a city or municipality, more stringent limitations may apply so it is best to discuss this as soon as possible with your lawyer.
Once you arrange legal representation, you can focus on recovery from your injury while your lawyer handles all of the necessary communications with the insurance company and the paperwork.