This website has many forums, each devoted to a major topic area of the creation/evolution debate (there's also a miscellaneous forum). Threads have a specific topic within one of the major topic areas. Your idea of a 'trading places" debate is fine, but you need an actual topic.
I understood from the title that you'd like to discuss the flood, but what specifically about the flood? If you glance through the Geology and the Great Flood forum you can see how many aspects of the flood there are to discuss. Recent threads discussed how the geologic column forms, Walther's Law, the ark, the Grand Canyon, where the flood waters came from and where they went, how limestone layers form, sea floor formation, plate tectonics, fossil distribution, ice ages, etc. etc. etc.
If I could make a suggestion for a flood topic, how about presenting and discussing the physical evidence that the Biblical flood ever happened, meaning a global flood around 4500 years ago.