All these are free resources:
Improv is a great way to start out: http://freedrama.net/improv.html (Complete Improv Workshop and MadScripts are really good)
Next, students could do something similar to the Free Online Acting School:
Then you can produce a play with the students. Here is a process list for producing a play:
Plays like "The Weird, Wild and Wonderful Days of School" and "Between Good and Evil" might be good ones to start with. They are a series of scenes and would give the students a way to work in small groups on each scene. Or doing a series of short plays can work well too.
Weird, Wild and Wonderful Days of School: https://drive.google.com/open?id=0B3kAjbl6WbIDM2gxU05XZ2x0TVk
Between Good and Evil: https://drive.google.com/open?id=0B3kAjbl6WbIDTEZHZkU5UzNyM2s
Here are the requirements for producing a play by D. M. Larson from Freedrama for FREE! http://www.freedrama.net/nocost.html It's always nice to have free plays to perform as a new drama teacher.
Please let me know if you have any questions in the comments below and I will be happy to help.
One more resource (not free, but low cost)... I also have a low cost class called "Drama Games" available for college credit if you'd like to take this and get some more help as well.