I'm a fourth year student in secondary school, I'm currently writing an essay regarding the Second World War, and would love to hear your thoughts on the question "What impact did the rocket inventions of the German rockeeters have on WW2?", please feel free to critique my question and drop tips on what to note when researching and writing this essay. Thank you!
They definitely had more of an effect on the post-WW2 world than the war itself with Operation Paperclip getting German scientists integrated into US-based R&D. Most notably with Wernher von Braun and the NASA rocket programs.
From the Encyclopedia Astronautica, the V-2 rockets weren't cost-effective but still did material and psychological damage. All-in-all they were hardly the wunderwaffen promised. While the V program itself wasn't a game-changer in terms of the war, they would be a major stepping stone for missile technology that we still see in use today.
Like a lot of historical research you can start with the links at the bottom of the Wikipedia article which contains references to several books. Just make sure to review them or run them by your instructor. Reading a couple peer-reviewed journal reviews of the books is a good way to get a good idea of what professional historians think about the work (it's not a substitute for actually reading the book though).
The German rocket program was a colossal waste of resources and helped the allies win world war two. It was tactically, strategically, and operationally insignificant at the cost of large resources that could have better been used elsewhere.