I teach a Learn to Quilt course at my LQS. I'd suggest a good book for beginners like Alex Anderson's Start Quilting. Each chapter tackles a different aspect for the new quilter, beginning with selecting the right tools. With their own copy of the book, students can read up at home, or reread after you've taught a chapter. The books can be obtained quite inexpensively from Amazon used online.
I have also learned that it is much easier for you and less frustrating for the students if all in the class make the same pattern. (I think there are 7 or 8 quilts in this book.) One great thing about everyone making the same quilt is that when you are done, everyone can compare to see how colors, shades and tints work effectively in overall quilt design.
Now, I do have to say that, imho, Harriet Hargrave's University series is far better for the serious quilter, but Alex Anderson's book is good as an introduction that is not too complicated. Hargrave's books focus on how to increase accuracy and that can be tough for newbies. Her quilts in the books may also be a bit advanced for beginners although the directions are wonderful.
If you have specific questions about how to organize or teach the class please PM me and I'll help as much as I can. Good luck and don't be afraid...if you love quilting, people will pick up that enthusiasm from you.