Teaching videos about Bonsai as it is but, only a VERY few for tropical trees.
I wanted references about the tropical fruit trees and bonsai and there are almost none out there or I haven't founded yet.
There are indeed far less pages and videos about the species you mentioned. Reason: they are not so suitable for bonsai, especially lemon, orange and certainly mango. Their leaves are large, do not reduce well, and the fruit will not reduce in size at all.
You'll find far more information about the 'traditional' bonsai trees, like junipers, pines, maples, azaleas.
Maybe you can ask Bonsai Barbados (I googled that...), they may be willing to help you and tell you what works well in your region.
www.facebook.com/BonsaiBarbados/