Hello and welcome to the site ,in case you're new here. Protection spells would be great and are recommended for beginners. But to get there( to be ready to cast a spell successfully) you have to learn the Basics first for a while(it does take some time).
The Basics:Tools,Meditation, Visualization, Moon Phases, Colors, Days, grounding and centering, power flow, Elements, circle casting, Charkas.
Learn the basics, study, and practice regularly.