I need your help!

In a few days time I am going to give an English lesson to adult beginners.

Perhaps you should just start with short greetings and simple responses.
Like; 'Hello' 'do you speak English?' 'Where are you from?' 'What is your name?' ' My name is ---, 'Goodbye'.
I am interested to know where you are Tracy, where did you learn English ?

I'm in Perth, Western Australia.
I was in China last year and taught a few night classes to young adults.
What we did the first night was;
1) teach the words and short questions and answers. Teach pronounciation and meaning, we taught culture as well. (For example it is a standard greeting to ask someone how they are in Australia. We do not expect a detailed honest answer, just a simple polite response).
2) We then got the students in two lines facing each other and got them to practice the simple greetings and responses. We had the words written on the black board like a script for a mini play so the students could read it if unsure. (Most of our students were better at reading English then speaking it.)
3) We did this role playing at the beginning of every class. By the end of the week the students could do this well enough to speak briefly to English speaking foreigners. LOL, ok, probably only if the foreigners gave the right response.
This will take more than 15 - 20 mins unless you keep it to only a few words.
This worked very well for us, we had less than 20 students though.
Hope this helps.

Try this site, Tracy. There are lesson plans and sample activities. All free from Dept. Education in England

http://www.dfes.gov.uk/curriculum_esol/help/

take it sloely and listen to people we all have storiys to tell, ti usually meens weve gone into our child days we all engoy our little chaters like now