Hello peeps, I apologize if this information is in the OP, but after an admittedly very quick skim read of the post, I feel the need to ask the following question: 

Can I create an entirely new race, and if so, how would I know where to put them? I have a small civilization in mind. Not big on the numbers at all, so that I could fit them in the tiniest nooks and crannies in the land :p