what are the synonyms for "telecommuting"?
It simply means you work from home.  I "telecommute" on occasion, because I can be fully functional working from home on my laptop.  Other people have all the business tools needed to be fully functional while working from home.  In summary, that is what telecommuting means.  :)
It depends on the topic. Can you be more specific? WHat do you teach? Maybe you should establish a link with the previous lesson. If it is not possible, just say : Today we are going to study...