Jeff,
Being a brand new ESL Teacher can be very scary. One thing I did at the very first class with my Beginning ESL Students was to teach the following Information: 1) Personal Pronouns -I, You, He, She, It, We, and They; 2) Conjugation of the verb "to be"- I am, you are, he is, she is, it is, we are, they are; 3) Contraction of the verb "to be"- I'm, you're, he's, she's it's, we're,they're; 4)Use of Articles "a" and "an"; 5) Prepositions- on, under, below, next to, in the middle of, behind, in front of, in; 6) Question Words: Who, What, Where, When, Why and How- also the specific context they are used in and what each question word represents.

I also recommend that you look at this web site under ESL Resources and ESL lessons for other ideas and suggestions.
Dr. Yanni Zack