I've already posted links to whole sites that recount the fossil evidence in favor of a flood and for the size of the ark.
Believe what you want.
Where? Honestly, you can't claim the geological record is the result of the Flood, as there are perfectly preserved footprints, rain spatters and animal burrows within the geological column. These would be impossible if the sediments were laid down during a Flood. As for the size of the Ark, you are going to have a hard time fitting 5 million to 50 million pairs of animals into such a space along with all the plants, food and whatnot necessary for a year's floating. Not to mention the time required by the eight-person crew to feed said critters and clean out their wastes.