OPK newbie.... What to do?

Mrs A ✨ • Guess who’s back?! Baby #3 on its way 🍼👶🏾 October 2019 🙏🏾
So I said I weren't going to do this (doing ovulation test and checking bbt), I feel I'm becoming a bit obsessive now. However I have been told that tracking is the best way to get pregnant. 
I've just purchased a pack of OPK from amazon waiting for them to arrive.
What is it that I actually do? 
When? What? How? And how often?
I need answers pls. 
Thanks baby dust to all ?✨✨✨✨