OPK help

Hi ladies so at the end of November I had a CP, my first period arrived 6 weeks later (just coming to the end now). This month I think its probably best to track ovulation with opk's as I appear to be a bit all over the place and don't want to solely rely on Glows prediction and miss it. I have never really charted properly with OPKS and looking for a bit of help on how often I should take one (i.e. morning and evening or just once a day if so what time of day is best). Any advice would be very helpful x