Hello and welcome! What you should start out with is learning the basics - meditation, visualization, grounding, energy, chakras, colors, moon phases, and starting a Book of shadows. Once you have learned those basics, then you will find that casting spells would be easy for you.
There is a section in this forum for people just starting out. Check out Newbies, it's filled with information, and also look into the FAQ tab where some of (if not all) of your questions will be answered. There are other members who would also answer any questions that you might have.
Welcome, and enjoy the site.