I've a certificate in teaching English to YL and about 5 years total experience (as I teach on and off).
In theoretical terms, I would suggest that your approach with young learners involve pictures no matter what the topic. Remember that YL have a relatively short attention span, but are similarly very imaginative (usually) and this needs to be fed. Associate these pictures with words that tell a story, or give tasks that empower the learner to develop the stories.
As for a practical method --well, there are indeed lots of websites with free lesson plans, worksheets, tips, etc. Make use of them!
For Young Learners, my final advice would be this: the lessons have to be fun; and if you are having "serious" fun teaching, then the chances are that the learner's having fun learning. This makes them more receptive.
Be flexible! And don't fret --it's extra tuition, remember!