I need help creating a layout for a book. This is very difficult for me because I have never experienced this, so I ask if someone can help me. I read that /geometry is used to get the page margins you want, but I don't know how.
I would like to make a book a5:
Page size: height 21 cm - width 15 cm External margins with respect to the body text: left margin 2.5 cm - right margin 2.5 cm. Bottom margin of the page: 2.5 cm Top margin of the page: 2.5 cm
The space of the upper margin between the chapter number and the chapter name is 2.0 cm and the space between the chapter number and the chapter name with the actual text is 0.5 cm.
The body of the text is 16.0 cm in height, 10 cm in width.
Question: what command should I give to have these parameters in / geometry?
Thanks if you can help me.