If you have internet access and a printer you can access loads of free flash cards and with these using games you can run entire lessons - particularly with beginners to lower intermediate -- you don't even need a course book if you don't want one.
I have taught mostly with no course book (although I'm not against them at all), exclusively using games just with a few picture cards. I'm not a big fan of making zillions of photocopies anyway!
Even if you don't have picture cards you can have your students make some as long as you at least have pencil and paper.
To make your life easy it's good if you follow a course book anyway, to save you worrying about which language to teach, but you teach the language in that course book with games, and not using the book itself - it's just your guide.
Kind regards,
Shelley
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www.teachingenglishgames.com