Magical (spirit-commando) Beside The Black Raven, On summoning the Spirits Options

Hi i just want to know more about the instructions which are cited from "Magical (Spirit-Commando) beside the Black Raven"..

Do i have to write the seal on the same day i am going to perform the ritual? Does it have to be a butterflies blood? Or does the word "butterfly" signifies some sort of writing material from their time? Does the circle that is suppose to protect me need to be very big so that i can fit inside it?

personally the seal should be made about a week befor and everyday before the evocation stare at it and visualise for about half an hour a day and
study the spirit. The circle should be about 7-9ft. Remember evocation is not something that is practised straight from a books because then everybody would
be doing it. You should become successful in lbrp, middle pillar, visualisation and become mentally stable