I second reading the four star articles on the site :) I would also practice grounding and centering and meditation as core spell casting skills.
Grounding and centering is usually seen as imagining you're a tree and the blessings of the gods rain down on your foliage, through your trunk and into your roots where the Gods pull up the energy to the sky and repeat the process. There's also my technique where I envision I'm a messy deck of cards and I'm surrounded by white light. I straighten out the deck of cards and absorb the light but allow the light to ebb and flow like waves with the Gods. It's worked for me for almost 20 years :)
Meditation can be done several ways. I'm sure you can find an article on it :) My own way is to let my thoughts bounce around in my head and pay no attention to them. Another way, if you have a dog or cat, is to count 3-4 of their breaths to every one of yours. They breathe 4 times, you breathe out. They breathe 3-4 times, you breathe in. And you just focus on the breathing.
Good luck to you! And welcome!