First time TTC

Hi everyone it’s my first cycle actually TTC as my firstborn happened rather unexpectedly at 17 😅 So other than TTC, I don’t know any of the other abbreviations so please speak rather plainly in regards to cycles or explain what it means lol

Anyways, back to my questions. What am I supposed to be doing? 😂 How do I know when to start taking the ovulation tests? Do I take it in the morning (and every morning?) and for how many days? I’ve kind of seen some of the lines on others’ ovulation tests but how do I know what the different line shades mean and when am I supposed to do ‘stuff’ during those line changes for it to be most… effective? Also any other useful TTC tips are well appreciated. I’m 25, from UK as well. And I’m currently day 3 of my cycle on my period, I’m expecting it will end tonight. Thank you everyone ☺️

Edited to add: I took an ovulation test just now just because 🤷🏻‍♀️ fully expecting there to be just the one line but there’s this? What now?