I'm writing a scifi novella about life in deep space. So far I have planets/moons named Ixo, and Xaleil. There are species called the Quatha and Drokor...

When does this sort of thing start to seem contrived and cheesy? I haven't really imagined what the new species will LOOK like yet, may be part of my problem. I wonder a bit if I should have an artist make up pictures of alien species for me so that I might have something in mind when I'm describing such things.

I've never done any world building before. I don't want to sound ridiculous.

There is no....guide, is there, for sounding technical and realistic, while making up words, and creating alien worlds?