Are you just looking to learn what the missionaries will teach before committing to meet them in person? Currently meeting with the missionaries and want to review? Preparing for a mission and want to see how to prepare, or learn how to teach?
Video series like these are great for any of these things.
They go over the things the missionaries teach people who are preparing to be baptized or want to learn more about the church. I appreciate those who have gone to the initiative to make videos like these, and I've made a page on Missionary Media dedicated to showing these kinds of videos on the missionary lessons. To see it, click on the link to the left that says Missionary Lessons.
If you're not a member yet, watch them to learn more, and pray so that you can know if this is true. If you are a member, try making your own videos of the missionary lessons, even with your webcam or digital camera. It doesn't take fancy equipment.