Are your arrows matched to you and your bow? If not you'll never improve. Find the arrow that flies perfect, check it's spine and make a set to match that.
For your shooting, start with the basics. Learn proper form and concentrate on consistency in your form, your draw, your achhor and your release.
A good book might help you get started properly. My learning book was G.Fred Asbel's "Instinctive Shooting" but there are others who's style might be different. Which ever style works the best for you, stick with it. That's how you get more consistent.