Of course, there is the simplest way. There are ready-made pictures or books about composition in the painting and calligraphy studio or online, which can be copied.
First of all, you have to confirm what the blank scroll of calligraphy you bought is, that is, what specifications it is. If it is four-sided, it should be 400mm* 1 150mm (full external dimension). This specification can be written vertically and horizontally. If you want to write two lines of Han bamboo slips, I suggest you write them vertically. It should be noted here that calligraphy is written from right to left and from top to bottom. Don't write according to your usual writing habits. When writing, you can first write the words "Brother xx or Junhui Village" on the far right, and be careful not to write them in the top box. Leave a space of at least 5-7 words. After writing, you can write the text. The text is generally a few squares higher than Huicun, but don't write on it. Generally, leave a space of 1 to 2 words. The main body of calligraphy has many fonts to choose from, such as official script, regular script, running script and cursive script, which depends on your preference. I suggest you use running script or regular script, which will look more intuitive. After writing the text, you have to sign another line, that is, when and who wrote it. The general form is "xx year, xx month, xx book, xx place". It should be noted that it is best to use the heavenly stems and earthly branches chronology for the time here. Xx month is spring, summer, autumn and winter, and the text and inscription can be written in two different fonts, but generally speaking, the first word (back to the village or something) and the inscription must be written in the same font. There is no requirement for words, and the rest will not be explained. Also, those who have the conditions can be stamped, and those who don't can be avoided.