Geology tells us all we need to know about the possibility of a global flood. The good thing about that branch of science with regards to this topic is that whatever is asserted by those that believe a worldwide flood happened can be readily checked with our evidence. That alone allows you to forget about how animals got to this ark and how this ark was built etc.
http://talkorigins.org/origins/faqs-flood.html
However that is a complicated subject that takes time to learn and understand. So instead focus on the contemporary civilisations around the world that make no mention of a global flood (or getting wiped out) and continue with their progression oblivious to this supposed event. Google will throw up all manner of information about societies alive at the time this flood was meant to have happened...