What do you suggest me to do?! please!

Hi there every body;[H]

I hope you're spending a wonderful day;
Actually, I am a teacher of English, I teach communication English, and I really enjoy doing this job, I feel like never before,

In fact, I was asked to teach business english to staff members of a private company, and to be honest, I've never taught Business English before, so that if I agree, it'll be my first experience!

The issue is that, we work on the new interchange method, and I know that there is not a big deference between the two englishes, but, I don't know what to do? witch method should I follow?

I would like to get some help here, please, anyone who has an idea about a website, or books that can help me doing this mission, please, tell it to me, and I'll be so thankful! especially, a clear program, or a plan of work, that can be followed to reach a positive results!

thank you very much; [Y]

Louahmed!