I recommend aocwiki.net to help fill in the basics. 9 races and 8 bases archetypes and that can be further augmented through a secondary class for a total of 64 unique classes. None are gender or race locked. Any class can use any weapon with varying degrees of success. Those are some basics to get you started on the the learning curve for what is planned.
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I do a video series called Ashes 101 where I break down the more complex parts of the game academically.