I want to create a plugin that should put a content box in between the my topics. After each 2 topic i want a content box.
Hello Shatabdi,
This is not necessarily an easy task.
Have you had a look at Developing Discourse Plugins - Part 1 - Create a basic plugin?
If you don’t have any code base you wrote and which people can rely on to help you, then consider paying someone to create such a plugin on marketplace. 
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I see you have posted a similar message here:
Is it for the same purpose? If it is, then I’ll close this topic in favor of the other one.
yes
this is the same topic