The checked calligraphy paper is divided into two columns, and each column has half a blank column. What do you mean? Similar to the picture below. There are two blank columns. What are they for?

The calligraphy paper you mentioned is generally used to write regular poems. Count how many squares there are, for example, there are 28 squares, then you can find a poem with 7 unique words, which is exactly 28 words. It takes 20 lines to write a five-line poem, 40 lines to write a five-line poem, and so on. How many words do you want to write? You can buy paper corresponding to the grid. There is a blank line on the left, which is used to write signature and seal. Writing methods about signatures can be found on the Internet. I hope it works for you.