作文如下：
Dear Paul,
亲爱的保罗：
I am glad that you want to study Chinese, which is one of the most artistic languages in the world. It is true that there are numerous Chinese training schools available on the Internet, and it takes some time and technique to find the best one. My suggestions are as follows.
我很高兴你想学习汉语，汉语是世界上最具艺术性的语言之一。诚然，互联网上有很多中文培训学校，要找到最好的学校需要一些时间和技巧。我的建议如下。
First, teachers are very important. You should choose a qualified teacher, a teacher with seasoned teaching experiences. Second, you should choose a course that is suitable to your Chinese learning abilities.
首先，教师非常重要。你应该选择一位合格的教师，一位具有丰富教学经验的教师。第二，你应该选择一门适合你汉语学习能力的课程。
Last but not the least, a course that has variable forms of teaching styles is better, because the learning experiences will undoubtedly be more enjoyable and easier.
最后但并非最不重要的一点是，一门教学风格多样的课程更好，因为学习体验无疑会更愉快、更容易。
I hope you could find a satisfactory Chinese course. Good luck!
我希望你能找到一门令人满意的中文课程。祝你好运！
Li Hua
李华