I'm ready to start tracking my temps! I would love some tips!

So I've been TTC for two months now. I have irregular periods. I use OPKs but I pretty much have to wait till I start noticing EWCM and them use them to confirm because the app never gets the timing right lol. I just ordered a basal thermometer should be here today. I'm hoping I'll be able to track ovulation a little better instead of just guessing lol. So I know that you take your temp in the morning before you get out of bed...but that's it. How long before you see a pattern? AF started today can I start temping tomorrow? Is this even gonna work for me with irregular periods?

Thank you in advance!