ADVICE PLZ— ovulation tracking


I’m new to the world of ovulation tracking & realizing I could use some advice. My boyfriend & I are not exacting ttc just yet but hopefully in the near future. I’d like to start tracking my ovulation now so I have it down better when we do start trying. I’ve been off my birth control for almost a year now in order to allow my cycles to regulate as I took oral birth control consecutively without a period for quite a while. However, my cycle length seems to be anywhere from 24 to 30 days. Should I start doing opk tests as soon as my period ends or what?! Any advice is appreciated! Thank you!