For your first bow, you should ask a local archery shop, an archery coach, or a more experienced shooter to help you make the right choice. No matter the style you want to shoot, the size of your bow will depend on several factors like your age, height, and draw length.
As a beginner, it is best to use arrows that are at least an inch or two longer than your draw length. For safety reasons, always go with longer arrows. Never go shorter.