Teaching kids English

I'm helping some friends lead a summer school in English.
It will only consist of 5-6 classes.

What's the best way of having an introductory lecture?

They're all younger than 14 and they know almost nothing about English.

What do you recommend? A test, some games, etc...

>>1
>they know almost nothing about English.
Do they know nothing "about" English or do they not know any English?

What's their skill level? What exactly are you teaching? What's the context? Need more information.

They're just kids. I'm from Croatia, they come from random backgrounds and they know very little English, that's why they go to a summer school to get introduced.

Some of them are aged 5-7 and know practically nothing.

Others have watched TV, been on facebook and are generally more introduced to English--they can pronounce dog, cat, book and such, but they can't differentiate present simple from present continuous. None of them are connected, I just need advice on how to conduct an introductory lecture.

Any word games, crosswords, naming stuff in English and Croatian.

Have you had any experience when studying as a child?
What do you remember?

What does Cambridge do when faced with novice learners?

>>3
If they know how to read, I would bring simple children's story books. Walk them through the story, showing pictures and explaining what's happening. Just make sure you can engage the older kids too.

>>3
maybe teach them the alphabet if they don't know it. Then how to say they're from Croatia, their age and name. If they master that hobbies/activities.

It may be worth splitting them into ability groups. Especially since there's more than one of you.