New conlang idea (10 letters)

Thinking of making a conlang in my world out of 10 letters any ideas? It will be spoken by people on a atoll group (3 atolls) largely spoken in 1 but minor influence in others or maybe it will be the main one I don’t know yet the the province is called pumba islands and made up of the 3 atolls it’s the richest per capita province in my country