If you are claiming for injury as well as bike and kit damage, then get a “good” solicitors involved, there are good ones out there, Cycle Aid have a good reputation, and if you contact them direct you won’t be hounded by others.
Report it to his insurers, but also make sure you document everything, take pictures of your damaged kit and don’t throw it away, keep receipts if you replace anything straight away. Keep the receipt for the bike as you say you’ve just bought it to prove what the bike is worth, if no receipt, ask the shop you bought it from for either proof of cost of the exact same new, or a Pro-Forma invoice for what it will cost to repair.
If you feel that physiotherapy would benefit you, contact his insurers, they will ability to arrange this for you under the Rehabilitation Code (2015).
The more you can document your claim, the more you will be able to recover the monies, even down to trips to physio/bike shop/ medical appointment etc with mileage.
If they drag their heels over liability, then press the Police for a copy of their original report.
Any problems, happy for you to email me as i was a personal injury lawyer dealing with motorbike and cyclist claims for ages before switching to the other side.