It is up to you and how you prefer to do your spells. Not all spells require casting circles. To do a spell without actually using anything you need to visualize.
I take it your new so I must ask Have you learned all the basics? If not I would not recommend casting any spell period until you have. Not just look them over I mean honestly learn them. I have lots of links on my profile feel free to check them out.
Here is a list of the Basics
The basics Tools,Meditation, Visualization, Focus, Moon Phases, Colors, Days, grounding and centering, power flow, Elements, Circle Casting, Charkas
This link is for the Basics