How to make a book

@#1 I guess it's cause nobody can really help you, inside mcreator at least :/

You need to code or messing up with gui, but you'll never get something really similar to a book

Or it is because people sometimes need to sleep. I have not any time now, but I can describe it later

Simply you need an Item. Then you need some class that extends GuiScreen. Theoretically you can use the mcreator GUI element , but better is use empty overlay and make it manually. In the GUI are simply some variables like current page , total pages , text arrays, image arrays. Then you drawScreen check for current screen , display the text/images , buttons for changing pages. The GUI you call in Item by:

[spoiler]

@SideOnly(Side.CLIENT)
    public ItemStack onItemRightClick(ItemStack itemStackIn, World worldIn, EntityPlayer playerIn)
    {

       Minecraft.getMinecraft().displayGuiScreen((GuiScreen) new YOUR_GUI);
        return itemStackIn;
    }
[/spoiler]

use gui

similiar question

https://mcreator.pylo.co/comment/34261?page=0 

:(

Use patchouli. It's a plugin.

You can use this https://minecraft.tools/en/book.php to write the book, and then execute the command in a procedure