Buying a motorcycle, what’s next?

Hello, the following “problem”: I looked at a motorcycle about 1-2 weeks ago, which I thought back and forth and decided to buy other tours. Since the seller lives more than 150km away from me I do not know exactly how I can bring the motorcycle to me most cleverly. At the moment it has 82hp and still has to be throttled. The throttling will take place in the town of the seller and he also offered me the motorcycle for throttling into the factory I just don’t know exactly how to register with this and do everything. Papers are still with the seller. Thank you very much for helpful suggestions like how to handle this most cleverly. Ulti