Regarding your third eye, you should balance all your chakras don't focus on one, one chakra being too open or close can ne a bad thing since energy will pool, the flow needs to be even.
First you should know what spells can and can't do, spells to transform into a cat won't work. Magick is a way to tap into the energy found in nature to create change in tour life, this energy is part of nature so spells that to against nature do not work.
Energy can be charged through meditation, but drumming, dancing, singing, jumping and many other ways. If you can feel the energy enter your body, it the best method for you. Study, work on meditation and energy work before casting again