Hello! Calculate how many squares you have left first, and then leave two rows up and down, empty. Is to put your head and feet aside. I think your text is written in regular script, so if you sign it, you can use running script (regular script is ok, running script is better), and then if you are as big as you, if you finish writing and stamp it, you will stamp two chapters, that is, two words.
You do the math yourself, and then you can play part of the signature yourself. You can write some thoughts!
I am a teacher who teaches calligraphy and Chinese studies. I hope my answer is helpful to you.