Your answer is there have a look :-) http://www.myenglishteacher.net/willandbegoingtolesson.html

"I will" is when you intend to do something, but not a plan: "I will go to the supermarket (because we have no milk)" "I am going to" is more like a plan: "I am going to go to the supermarket (after work)" Often you can use both

be going to represents something you are going to do in the very near future for example im going to eat now will represents something you are going to do in the far future for example i will eat when i feel hungry

-Use "will" when you decide to do something at the time of speaking. The speaker hasn't decided before. Eg: "I don't know how to use this camera" "It's easy! I will show you" -Use "be going to" when you have already decided to do something. Eg: "I have decided to repaint my room. I am going to paint it green"

I got it. Thak you for all coments!