I encourage you to read this excellent post from the Tenured Radical on how to teach lecture classes well.

As she puts it:

The lecture class is worth learning to teach well because this is where you will build your reputation as a teacher. It is where you will recruit students into your upper level seminars, into your major and perhaps even into honors work a few years hence. It is subsequent to being exposed to your intellect and charm as one of 50 to 100 people that they will muse, during pre-registration, “Maybe I’ll take Radical’s seminar on the Cold War. I took the survey and it was pretty good.” As your students fan out onto the campus, they will tell their peers, the frosh who they guide as a Resident Advisor, and their teammates that you are worth learning from. In other words, if you have a reputation as a good teacher, you will get good students.

And her advice is excellent.