You have to learn French for more than 500 hours. See if the university you are applying for has any specific requirements. Then you must take the TCF or TEF exam.

Application material

There are a lot of application materials, anyway, just some letters of recommendation, motivation letters, resumes, transcripts and the like, as well as property certificates and accommodation certificates, so I won't go into details.

expense

Personally, I think the cost of studying in France is at least 40,000 to 50,000 RMB a year (students can do some work on a visa), which basically includes rent, insurance and living expenses, depending on how you spend it, whether the school is public or private, and whether you study in Paris or other provinces. These aspects will be different.

Suggestions for studying abroad

Don't worry about it when you are a freshman. I suggest you know more about the situation. Maybe you will change your mind in the future. I wonder if you have studied French. French is still a little difficult. Many people learn French incompletely. China people in France are said to have the largest number in Europe, so you should consider your life plan after studying abroad, whether to return to China or try to stay in France (the latter is really a bit hard).