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How do I find out the cost of parts and is there videos I can watch to do the job
It is almost guaranteed to cost more than a new TV, that is if the “spare parts” are available.
https://www.sony.co.uk/electronics/support/articles/00287579
You never know, there may be some parts on eBay.
If there are no videos on YouTube, then I’m afraid that you will be unlucky.
I’m afraid that repair/replace screens, even under warranty are a thing of the past. Sony simply replaces the TV.
How did the damage occur, and do you have any Home or other insurance that might cover the cost of a replacement?