Well, if you haven't practised the Basics well, you probably won't be able to cast spells properly.
Magick is not all about casting spells. If you jump directly to spell casting, you will get nothing but failure. You need to first learn and research what Magick really is, what it can and what it can't do.
Patience is an essential tool in Magick. You need to first go through the Basics of Magick, practise them, and then and only then, you can move on to spell casting. There is no fast and quick way to Magick.
The Basics are Meditation, Grounding, Centering, Visualisation, Energy Manipulation, Tools, Correspondances, Chakras, etc. The link to the Basics is-
The link to Basics Expanded by AwakeTooLong-
The link to Starting Out by Starrie-
With due patience, I am sure you will be able to cast spells. So learn, learn and learn!