Ask the ladies what they want to learn and then go from there. What do you plan to teach them? Hand quilting? Machine piecing? Hand appliqué - Machine appliqué?
I believe in hands on teaching, so if you are starting from the very beginning from picking the fabric, preparing the fabric, cutting the fabric, I would have a station for each person to try it too. Watching only gets you so far. you need to do it.
What part of Brazil will they return to, and what is available to them there? If they don't have fancy machines there is no reason to show them all the bells and whistles on the current machines. If they can't get rotary blades down there then teach them to use scissors.