Oh, it�s a looong subject, but I�ll try to point out a few important aspects:
1) You need to skip reading and writing all together. It would be extremely confusing for them, as the whole idea of letters is still mysterious to them (and the rules of reading which they might have come across most likely don�t apply to English). The way you learn a language (native or foreign) at this age is by listening and speaking, and that �s what you must use.
2) Focus on vocabulary first. Use visuals extensively (flash cards).
3) Teach complete functional phrases (and act out the situations in which you use them), no point in trying to explain grammar rules to them. Hand puppets are great for acting out dialogues (kids love them).
4) Such little kids have lots of energy and they�re very physical, expect them to run around for most of the lesson... Try to employ that energy in learning tasks (like games involving physical movement, eg. run and tap the flashcard which represents the word I say, then give a next word for the next kid).
5) Remember they see the world differently than you. Don�t try to teach them words which refer to concepts unknown to them (like abstract or formal words or big numbers) and phrases they�d never say in their mother tongue (unless it �s a cultural difference, like "how are you?" - often non-existing in other languages). Hope you have some kids in your surroundings (or your own) and you can watch what they naturally talk about (and how), what the elements of their world are.
6) They will not have internal motivation for learning, you need to give them a reason to follow you, like rewards or the fun of doing the task. Try to invent rewards for which you don�t have to pay (like a self-made paper crown for a game winner or self-made origami works) and systems of rewarding (eg.: 10 little flowers drawn in the kid �s notebook for giving you good answers -> 1 origami elephant given).
7) If I didn�t have a formal training, I think I�d like to help myself with a coursebook. I don �t have a great insight into the current offer, but my more experienced friend recommends "Kid �s Box" (part 1), preferably with the Teacher�s Book to it. You don�t have to ask the kids� parents to buy those for them, the book is mostly for you. And you can later make some copies for your pupils.
8) In the future, consider doing a CELTA YL (Younger Learners) course (an extension to CELTA), even though they focus on 8 - 13 y.o. kids and employ writing and reading. But they say very useful things about teaching children in general.
9) Try googling more tips and example activities? I�m sure you�re not the first teacher who faces such a challenge.
Good luck!
