[@BBeast] Personally I think it's better to start with a blank slate and level three gods. Better to let them establish all the terrain for themselves and do ecosystems from the ground up, rather than pasting over whatever someone decides is the default. 

On the other hand, it does mean that if people want Earth fauna they'll have to create it themselves. Which is a good opportunity to make certain animals inherently magical or give them a fun backstory beyond 'they evolved', but will take a little extra work.

Similar but also important question: do we want to start with an all-land planet, an all-sea planet, or a mix? If the latter, what do the continents look like? We can use a random generator and go with whatever seems fun. It basically depends on how much water civilisation we want and early we want to bring a tonne of sailing / alternative long-distance transport in for the land dwelling folks.