First time preparing and teaching a course
Rather than simply preparing material and plowing through it, I strongly recommend taking a "backward design" approach. You can Google that, but the basic idea is to start by thinking carefully about what it is you want students to have learned by the end of the course, and working backwards to what lectures, activities, and assessments contribute to this end. I've found this to be very useful, both for myself and for the students. 

As a general idea, keep in mind that teaching and learning aren't equivalent; it's easy to deliver material, but that doesn't mean that it's absorbed or understood, and it's worth thinking about what classroom activities make learning more likely. Your (present) university probably has some sort of teaching consulting group, who are probably worth chatting with. Good luck, and have fun!