study techniques for niche language?

My parents immigrated to the US from a very small (pop: ~2 mil) country. The country at one point was a british protectorate so almost everyone there speaks English (it's technically the official language of the nation). Therefore, there aren't a lot of resources to learn the language because no one would ever really need to learn it outside of immersion (My parents get long, disappointed stares whenever a stranger realizes that I don't speak it).

That being said, I realized that the bible is translated into basically every currently spoken language and that it might be one of the best resources I have. It's the only thing I have that would have that I could read in my TL and English and as well as listen to.

My question is how exactly should I go about using it? I'm a Christian so I have no issue studying the bible I'm just not sure what to do. Should I make flashcards with verses? Should I just read/listen over and over again?

The idea of basically creating my own language course is so daunting but I'm just so tired of feeling so insecure about not being able to speak it.

p.s. I have been to the country with my family multiple times so if you'd like to suggest sitting around a fire and listening to people speak it for 3 hours, believe me I've done it before ;)

TLDR: how do i use the bible to learn a language there are sparse resources for?

*edited for formatting and TLDR