Well if you are a beginner to magic, you do not start off with casting spells. Your profile is blank so I will assume you are new.
You should take the time to learn the basics of magic and research what magic is and how it works. The basics you can look into are meditation, centering, grounding, energy manipulation and visualization. These can be found in the forums or you can search for them using the search bar in the top right hand corner.
This will take some time. Most people who have been practicing the basics for a year or 2 have not even cast their first spell! Take your time and all the knowledge you seek will come to you in time.