I flip fire-damaged properties and own a fire damage restoration company. It can be a big undertaking--Unless you are rather experienced with this type of damage, it may be hard for your to tell the extent of damage.
The challenge with fire damage is that there is more than meets the eye. For example, often fire damage is water damage--they put the red stuff out with wet stuff. Unmitigated water damage becomes mold damage and and there is the potential of extensive smoke damage in the same airspace. So even elements that don’t appear damaged can be contaminated. Also, ODOR is a huge issue. If the odor is not properly mitigated that will cause ongoing problems.
I would recommend you find a fire restoration company/contractor to walk the property with you and give you a good understanding as to what needs to be done. There are many things that could be overlooked as part of the renovation on fire-damaged properties.
A few questions: when you say "you have"--do you mean you just bought it? Did you buy it with damage? Did the damage happen while you owned it? What is the status of the insurance claim? If there is any way I can help or answer questions, please let me know!