I usually make the models first, than save an un-animated version and load these in every different scene I'd like to use them in. To de-animate the whole model you have to select every object that has a keyframe and then scroll to every keyframe there is and delete it. When animating it's handy if you group/parent your models in a way that makes them easy to animate. Also keep this in mind: When you select a group and also select an object in that same group at the same time and you try to move the selection then the group moves and the object in the group moves twice as fast and far, because it's movement is added to the movement of the group it's already in. I hope this makes sence.

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