If you haven't already, pop along to amazon.com and grab a copy of Light, Science & Magic - 4th edition (Kindle is fine). I personally guarantee that it will do more to improve the quality and understanding of your photography lighting than ANY other book on the planet.
If I had to suggest just ONE book to a new photographer, that would be the one.
Don't think about it - just do it (just trust me on that!).
When you get it, work through it methodically and a big grey mist of this thing called lighting will be lifted forever.