I updated your title and moved the post to Blender and CG Discussions. Have you tried searching for creative commons 3D models? I’m 100% sure you can find this online.
It would be nice to see some of your credentials. I mean if you have talent as a filmmaker, and it looks like your work has promise of going someplace, it would entice someone with free time to give you something free. I have been known to do that under the right circumstances and if I (or my studio in this case) has some feee time.
That said, there are technical questions that need to be answered overall.