If you like the Necronomicon vibrations more (wherein the ancient names of Demons are used), you can work with the ones on this page after you have performed the opening working for any chakra you will be using them on. However Necronomicon meditations can be tricky and must be done according to the astrology stated as they tie into planetary energies as well. You can find the SS 2019 Calendar here on the forums which is immensely helpful with that, as well as keeping an eye on the Planet Watcher website.
https://www.satanisgod.org/www.angelfire.com/empire/serpentis666/Necronomicon_Meditations.html
You can also work on your Third Eye with the SATANAMA mantra or just plain chakra breathing while looking through it.
About the sensation you mentioned with "Thaum", yes, as different people feel energy in different ways when becoming more sensitive to it; for some it is warmth, for some, cold, for others, it is a tingling feeling, etc. However Thaum is a more powerful mantra so it is easier to burn yourself out with it, which is not something you want to do.
Energy Healing is described in detail in the "Satanic Witchcraft" section of the JoS main page.