Hi, Patr�cia.
I �m also teaching an Efa course for the first time and my adult sts didn �t have any English notions!
So, I recommend you to start softy with greetings, elementary grammar(verb to be -simple present and verb to have), classroom instructions!
An interactive board that my school provided has been very useful to motivate them.
Also try easy English songs to teach the basics.Good luck!
Contact me anytime if you want any help.