How can I figure out my cycle length?!

Hi all

So I’m currently breastfeeding my 15 month old but want to start tracking/checking I’m ovulating regularly over the next few months before trying for baby 2 at the back end of this year.

My period came back at 8 months when I went back to work, although initially much lighter than usual. They have been much heavier over the last few months but I’ve not really paid attention to how regularly they were happening 💁🏻‍♀️ I decided I wanted to start tracking them when me and hubs went to New York but as my little one stayed at home I had a ‘bleed’ from not breastfeeding her... then nothing for 6 weeks. I’ve just had my first period since then but I don’t now know how to go about figuring out my cycle and when I should be ovulating to test. Any help please?!