good day, I have to buy a cheap used car and then sell it again with a little profit. Now my questions: 1.Where do I get red number plates and what does that cost? 2.When and how long can I drive around with it? 3. I buy the car from private. at this time it is still registered. can the car then simply be deregistered and can I drive it with the red number marks when I try out? 4. how is the car insured if you have a good day, I have to buy a cheap used car and then sell it again with a little profit. the test drive something happens or if I have to move the vehicle otherwise. 5. which costs arise if I have such a vehicle? maintenance? all infos will help me. thank you!