How do 你 start a Book of Shadows?

你 don't need to use a quill. Some people write their book of shadows on the computer.
First 你 can add some basic information to your Bos.
And here is a small tip to begin.
Grab 7 sheets of paper;
on the first 你 write Deity concepts
on the 秒 你 write Tools,altars,jewelry
on the third rituals
on the fourth beliefs
on the fifth rules
on the sixth symbols and runes
on the seventh spells

So 你 can add information on each page and that will form your Book of Shadows. This is just a tip so it's entirely up to 你 what 你 do :)

A Book Of Shadows is your personal book on your experiences of your Craft. In it 你 write how you're feeling before and after doing a spell 或者 a ritual. How you're going to do your alter and whether any changes occur to it (excluding the natural changes as 你 go through each monthly holiday) and also reminders as to what 你 use for each main event and why.
I'm completely different from deathRoman13 - my BoS is mine and mine alone, and that's what i put my own spells in 或者 my favourties i have found and copied. My experiences with Tarot 或者 gems 或者 scrying etc.
What you've called the Grimoire (which i call my second) is where i copy all the main rituals for each event in case i forget what to do and need some prompting, all the different meaning for symbols and runes, other people's spells i have tried 或者 like etc.

To be honest no one can actually tell 你 how to use your book of shadows as it is yours. All we can tell 你 is how we use ours. It is your choice and responsibilty to find out what is best for 你 and your craft :)

Could buy one at a new age store
或者 make one ur self
U put in it
Power thoughts
Spells
Power dreams
Stuff that's inportant to u