1, at least 10 hours per week. As for how to distribute it, it's up to you.
2. Starting from the posture of holding a pen, don't let the child sit and write, remember!
3. From the post, you can start with Yan Zhenqing's "Praise of Dong Fangshuo's Painting" and "Yan". It is a basic problem to arrange more class hours in print. And be sure to explain the bookshelf structure of Chinese characters and the recognition of some traditional characters to children (calligraphy does not write simplified characters).
It's best to tell children about the origin and development of Chinese characters, and combine some short stories to attract children, such as the story of Cangjie's word-making.