As you saw, in the beginning it's not so much an issue of creating new landmasses as it is figuring out how the moving plates interact to form rifts and mountains and other geological items. These things in turn shape the movements of the winds and the types of creatures that may migrate in and out or even evolve to adapt to environmental changes.
Let's take this one step farther now. Last time we ended up with the following. Perhaps 10 million years into the future from the last time we visited our world. By this time, the first stage of supercontinent separation is complete.
As you can see, where we had underwater mountain chains before we now have some chains of islands. The continents have also broken into a number of pieces, and in one case there is a massive internal mountain range (which you can spot on the map by sets of jagged lines). Think of the Rockies.
What lives on these new continents?
The thing to keep in mind here is that your five contents used to be two. The continents on the western (left) side of the world were all one, and so have the same creature base to work from even though some might take different evolutionary tracks. The same with the continents on the East (right). As for the islands, they are quite literally mountaintops poking up out of the water. They could have creatures that no one has seen anywhere before. Critters that crawled out of the water and slowly became land creatures or amphibians. Think of the Galapagos Islands or Australia.
So, you can have some fun with this. Look at the many kinds of canids for example. You’ve got wolves, coyotes, and creatures that look canid but aren’t really, like hyenas and foxes. Wolves and coyotes probably came from the same ancestor somewhere down the line. All vulpine (foxes) types might have too. Somewhere I once saw a claim that foxes actually came from some long ago ancestor that formed two other branches during evolution, the dog and the cat. I’m not sure I believe it for Earth, but we can do what we want with our own planet.
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