You're going to need a camera and the camera should be placed over
You can try Go To Meeting for the software
Free 30 day trial.
I have used a few times
To go to it, there is NO "www", just erase everything on the url bar
and type join.me
Its free and works well for small and starting out. It's a division
of www.logmein.com, which I use and love.
Don't forget to RECORD these, you'll wish you had.