It depends on which spells in particular you are looking to use. I would suggest if you are Dedicated that you start off slow, and practice the Beginner's Guide I will post here for you to start, although if you are not Dedicated then it is advised that you do not practice any of these meditations including Void meditation as you will receive unwanted attention from astral entities or other entities who are directly enemies of Satan and you will be in danger.
High Priest Hooded Cobra's 40 Days Of Power. Again if you are undedicated I will say it again, DO NOT meditate under any circumstances even if you are just generally curious. When you Dedicate you are directly under Satan's protection and will be guarded when you meditate, I also advise as I do this with every meditation session to ask for protection before beginning every time.
Realize that just even cleaning your aura and chakras is witchcraft, and should be valued highly. You will see that meditation listed in the PDF.