Tell me how to track?

Brandi-lea • Khaleesi-May Dizney Van Vliet - my precious daughter born on 23.6.15 👶🏼🌸
Just ordered opk's , pregnancy tests and a thermometer to track my bbt.
​1) how do I use the opk's? How do I know when it's positive?
​2) when should I take a pregnancy test? What cycle day? How many days after ovulation?
​3) how do I know when I'm ovulating through tracking my bbt
​Thank you in advance and baby dust to everyone x