Keep in mind that in your first year you need to put in a lot of work in terms of preparation but it gets a lot easier. File all your lesson plans so you will be able to pull them out in the future to use again. Once you build a better knowledge of classroom management and structuring a lesson your preparation time will be reduced.
If you are interested in some efl materials (including teacher training) which can help support your work as an efl teacher please visit the following link...a range of materials I have designed myself. I am a Director Of Education in a school with 12 years experience.
I've used them a lot with great success. They can help you to have greater variety in the classroom and support a course book. Students find them very useful, effective and interesting.
Best wishes and good luck!
(From the UK)