Transfer your car from England

Hello guys, I would like to transfer an E93 325i from England as a right-hander to Germany. Unfortunately I have almost no idea. I have already chosen a car and would like to buy it around Christmas and transfer it to Germany. The plan is to fly the plane to England one last time to inspect the car and then take it with me and drive to Germany. My intention behind it is only the price and of course the adventure. It is a BMW 325i SE 2dr right-hand handlebar with 135,000km down (85,000 miles). The car has a license plate, which remains on the vehicle. The car has new MOT and its inspections behind it and is processed again for me. CoC papers the seller does not have. Only the vehicle license I received. The CoC papers are supposed to be only for the classification of the vehicle. This can actually be done with the in column K (number of the EG-T I know now my questions…. How can I transfer the car? Do I need a transcription mark? How does it work with the insurance during the journey? How does it work with the insurance after the journey? Which papers should I get in any case? What costs do I have in addition to the purchase and the fuel costs? Can I get the car after the inspection and the Receive the papers normally register/insurance? Maybe one can describe the exact procedure and help me laypersons Thank you in advance!