Do you have a kitchen? Look in your spice cabinet, theres probably something with magical properties in there, Basil, Sage, Cinnamon; even Table Salt has magical properties. Wait till no one is in the kitchen-, it can be in the middle of the night, just pretend you?re getting water or something; And take a small amount, not enough that anyone would notice.
Do your research, remember your not going to start out with things that are hard to find, like Rue, or mugwort. But you can do some great magic with just your basic household herbs. And having a good foundation with these herbs will help you as you progress. Trust me it will help.
Oh- and if your trying to hide this from people, which I understand being a closet pagan myself, I used to hide herbs in plastic sandwich bags (labeled with a permanent marker) by removing a bottom dresser or desk drawer in my room, and hiding them in the space between the floor and the drawer.
Just be careful that no one finds them or have a cover story to explain them, because this practice can look like your into a different kind of magic herb.
PS Don't do drugs.