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http://community.simtropolis.com/forums/topic/68091-official-tutorial-guide-how-to-turn-a-model-into-game-ready-asset-3ds-max/
You don't need 3ds max, as long as you can export an .fbx you're good.
And this wiki page might come in handy as well:
http://www.skylineswiki.com/Asset_Editor#Modeling
https://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/GVB,_LHB_M2,_34,_M53.jpg/1200px-GVB,_LHB_M2,_34,_M53.jpg