How do आप start a Book of Shadows?

आप don't need to use a quill. Some people write their book of shadows on the computer.
First आप can add some basic information to your Bos.
And here is a small tip to begin.
Grab 7 sheets of paper;
on the first आप write Deity concepts
on the सेकंड आप 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 आप 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 आप what आप do :)

A Book Of Shadows is your personal book on your experiences of your Craft. In it आप write how you're feeling before and after doing a spell या a ritual. How you're going to do your alter and whether any changes occur to it (excluding the natural changes as आप go through each monthly holiday) and also reminders as to what आप 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 या my favourties i have found and copied. My experiences with Tarot या gems या 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 या like etc.

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

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