As much as I would like to help you with something like this, I think that writing this should come from you. It's technically plagiarism and I would hate for you to get in trouble. Maybe you should take it step by step. I'm sure you've accomplished something in your life that you are proud of or at least remember it well. Start there and then see how far you can get. I'm always willing to make suggestions. :-)
Answer: Yes with possible slight variation A main idea is more general, while a concept is more specific. For example in an essay about child labour you could say the main concept is child labor, but the main idea is how to combat child labor.
