Below are some style examples to consider. The main decisions are: 

1. Widescreen or 16x9

2. Subject looking to camera or off camera

Widescreen gives a more cinematic feel to videos while 16x9 is more of a standard aspect ratio we see on web videos. 

Subjects looking to camera can create a more intimate connection with the viewer while subjects looking off screen more commonly seen in documentaries. 

I'm happy to give my opinion given the subject matter of these videos. There is no right or wrong answer. :) 

Widescreen, Subject looking off camera

16x9, Subject looking off camera

16x9, Subject looking to camera

Widescreen, Subject looking to camera