Meditation doesn't make powerful spells. It is a very good tool to learn but doesn't mean you will be able to channel energy or cast a spell better.
You need to work on learning about magick a bit more first. You need to understand why and how magick works, why and how to cast a circle, understand the elements and color correspondences, how to set up an altar and know the tools used....and so much more. Yes, meditation needs to be learned too under this but it is just one small part.
Here are some video links on one basic methods of meditation that I have watched and recommended. They will help you understand better what meditation is and how to do it.
https://www.youtube.com/watch?v=e0rSmxsVHPE (Very detailed about spiritual meditation)
https://www.youtube.com/watch?v=1UyJG2b8FMc (Really good for beginners)
https://www.youtube.com/watch?v=VT2zEYhGV5A (Another good beginner vid)
https://www.youtube.com/watch?v=F6eFFCi12v8 (Learning to meditate anywhere)
As for learning to channel energy, this can be done with visualization. Controlling energy starts out as being able to see that energy and how you want to move it in your mind first. Meditation will aid with this, especially guided meditations. There are good ones on youtube you can find after you get into the practice of regular meditation.