Documenting My Trip to Congo -- The Opening Scene

This is the opening scene of a longer video I'm creating to document my last trip to Congo. For the first time ever I'm writing out a script for voiceover so it's going to take me some time, but I think it'll be worth it.
I'll need to add some background tracks to this opening scene so that it's not just me talking, but I'm not sure the best way to do that yet and I wanted to upload what I've finished so far.
I'm using iMovie for the video editing and Garage Band for the voiceover audio.