I recommend using games with flashcards. If you don't have any pics then ask the children to draw them for you and use those.
With a few pics you can play hundreds of great language games to learn and practise vocab and simple structures - basically anything.
It's a bit like music, with three chords you can play most songs ever written!!
Anyway here's an example of a game using just a few pics:http://www.teachingenglishgames.com/games/relayrace.htm
If you like it there are plenty more on that site - just enter name and email to receive them free.
Then I really recomend that you start using songs in class. Yes I know that means a CD player and CDs but it brings so much to a lesson that I personally would not be without it.
I have songs here that fit your age group - these are v. popular with kids:http://www.teachingenglishgames.com/eslsongs.htm
And you might also want to look at Genki English songs - at least one CD of those is groovy - I like the first one best. The whole set can get a bit "samey" but they do work. Richard Graham has a great time with them at his school in Japan.
Bye for now