Hi!
I can help improve the audio on your video
It sounds like the "gain" from the microphone (or camera) wasn't setted up properly, since there is too much "floor noise". It can be easily repaired with some noise reduction plugins and EQ. Though unfortunately I am not experienced with Final Cut Pro. I can do it with other software, of course, but couldn't really teach you to do it in Final Cut.
Im very open to do it at this very low rate since I really need some references on the site, but I assure you the audio will be great!
Hope to hear from you
Cheers,
Pedro.