Report the fire to your insurance agent and ask for a complete copy of your policy that was effective the date of the fire.
The essence of your policy is shown on the declarations page and shows the limits for each bucket of coverage you have.
Obtain the contact information for your adjuster (there may be a few).
Don’t sign any contracts with mitigation/restoration companies until you have time to vet them and fully understand their contracts.
Take a deep breath, this will be a process and take some time. Don't rush into making any decisions