I'm not a modeller, but my understanding would be;
- Open the dae in a 3rd party modelling tool, such as Blender, Maya or 3DS Max.
- Create animations for the model. You'll need an idle, walk, run and at least one attack animation to work as an enemy.
- Export the animations.
- Assign them in the model editor.
That is the most barebones method. There's probably a ton of things that you also have to do, such as rig the models if they have not been done already, create/assign some sounds, export them with specific settings; I'm not sure, since I am not a modeller of any sorts.
You can also try
Carnivorous Jellybean's retextured suitor. It includes a static entity (Credits to The Chaser) you can use as a "posed" statue before you make it into an enemy.