1. First, contact the local bus company in Hengyang to find out whether to provide chartered service and related requirements and processes.

2. Secondly, provide bus companies with the specific needs of chartered cars, including date, time, place, itinerary, number of people and other information.

3. Then, negotiate with the bus company and determine the rental price and related terms, such as included services, payment methods, deposit, etc.

4. Finally, after confirming that both parties have reached an agreement, sign a formal car rental contract with the bus company to ensure that the rights and responsibilities of both parties are clear.