Hi Volkan,
I'm responding to this post because this is my area of specialty. I focus on teaching kids ages 4-12 and I use games to teach them. If you haven't looked into resources about teaching with games, I highly suggest you do so.
I truly believe that this is the way forward. The way I have been teaching (and many others like me), is truly revolutionary compared to what I experienced in school (not THAT long ago!)
My own experiences with this have been very rewarding, with children coming to learn from me in their free time, and wanting to continue, missing me when I was gone, etc.
Also other teachers using my games have reported similar great results.
As well as looking at games on many sites, and in forums, you can receive some free on the website below.
Kind regards,
Shelley
Receive free games and ideas to make teaching children more fun on:
ESL games and activities for teaching English to children