If you are completely new, I would suggest learning your basics first. You'll need them when casting a spell. Meditation, visulization, focus, herbs, moon phases, color corresponances, all of these are very important when preforming magick.
And also, there is alot of trial and error when casting spells, so keep a record of what works, and what doesn't. It'll help you later on if you decided to write your own spells.
I hope you find this helpful! :)