Hello Sophia.W,
I'm Mandarin Chinese tutor, am teaching one of my students young kid using this book My Fun Chinese, it's easy understanding material suitable for beginning level, with I CAN WRITE as well.
I'm teaching other students with using another set called Chinese Made Easy, with textbook and workbook too. For this series including Simplified Characters Version and Traditional Characters Version. Both versions are separately for kids and senior version are good for English speakers because of have English translation as well.
Some of international schools in HK are using this series material.
Base on my teaching experience, above mentioned 2 sets of learning Chinese materials are suitable for those kids and students' family background English speaking, but not good for kids and students are local and Chinese, too easy for them.
Thanks for reading !!
Miss Chen