This what I have so far of the system for this world.
Click image for larger version. 

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So far there are only three planets, Erda (the inhabited planet), Ouroboros (a "small" ringed gas giant about where our asteroid belt is (the rings don't show up on this scale)) and Adrasteia (inspired by the Nibiru/2012 conspiracy theories, it has an extremely elliptical, 5000+ year orbit that passes through the inner system).

Eventually, I plan on adding a few more inner and outer planets, depending on what would be conducive to the mythology of Erda.

Modeled in Universe Sandbox (also available on Steam).