Out of any book that I've ever read on the topic of evocation I have had the best results with this evocation ritual. You wanna do a form of white light meditation before you go into this ritual. Hold that energy within you and seal it within your ritual tools as you work through the ritual. To succeed with this evocation ritual you must stay in a meditative state throughout the ritual and reach the rapture state of your meditation. Once you reach the rapture state you will behold the spirit that your calling upon. I'm not going to list everything you need for the ritual because it is already written in the incantation.
This is the evocation ritual that can be found in Evoking Eternity by E.A. Koetting.
Creation of ( Stone/Wood/Plastic), be the Alter and foundation upon which my universe will be brought up into existence. I seal this calling upon you, and I seal the power to perform your function within you, Eternal.
Creation of (brass/silver/tin) be the chalice which holds the power of the operations of magick within you and offers the waters of life to the lips of the worthy. I seal this calling upon you, and I seal the power to perform your function with you, Eternal.
(Seal this power in the Dagger with both hands holding it up to and sealing it with your heart chakra.)
Creation of steel be the dagger through which the will and power of magick may flow and cause change in this world. I seal this calling upon you, and I seal the power to perform your function within you Eternal.
(Trace the triangle of manifestation with your dagger and see the ethereal red flames.)
Creation of magick, be the Triangle of Manifestation in which the Spirit (spirits name) will materialize before me when called. Hold within you the elements and forces required of (spirit's name) to manifest in beholdable form, before me. I seal this calling upon you, and I seal the power to perform your function within you Eternal.
(Trace your circle in fiery blue light.)
Creation of Art, be the Circle in wich the Eternal is made manifest now and in which all things are formed and unformed, past and future, are brought into present reality. I seal this calling upon you, and I seal the power to perform your function within you Eternal.
Consecrate the Wine.
Creation of the vine, be the Elixir which will make this flesh immortal, be the blood of God which will purify this soul, be the nectar which will awaken this mind, be the waters which will bring absolution.I seal this calling upon you and I seal the power to to perform your function within you, Eternal.
(Gaze at the Spirit's Sigil.)
(Spirit's Name), hear my voice, see my signs, and know that I command the universe to bring you before me, so that I may see you, so that I may hear you, and so that you power will be my power, your strength will be my strength and your knowledge will be my knowledge. I seal this calling upon you and I seal the power to perform this feat within this temple in which you will manifest,
(Focus on the Triangle of Manifestation.)
(Hold your chalice up above your head.)
I drink the blood of God. I take within me all of his power.
(Spirit's Name) I call and conjure you forth to stand in this temple and to take your place within the Triangle. I summon you to manifest before me in beholdable form and to speak to me in a discernible voice. (spirit's name) I give you license to appear, I give you power to manifest, I give you this call to come, (Spirit's name) Come!!
(When the Spirit appears.)
I welcome you to this Temple and I thank you eternally for answering my call and for your swift and full attendance.
(Spirit's Name) it is my will that.......
(License to Depart)
(Spirit's name), I thank you eternally for your attendance, and for the accomplishment of the tasks with which you have been charged. Go now into the world to bring to manifestation those things, armed with power and sealed with purpose. (spirit's name) you are dismissed.