TTC ovulation testing question

Hi there,
So my husband and I are trying to conceive for the first time! We feel like we're ready to start trying. For the ovulation tests I have the clear blue digital. Wondering if I should test in the morning when I wake up? I've heard to test later on in the morning and then when I ready the box it says to do it in the morning after a good nights rest? What should I do..
Also, my period lasts 3 days (August 3rd-5th) and my cycle is irregular sometimes it's 27 days others it's 25 or 28..when should I test and start trying? I've been testing ever since my period ended and it's been "low" and I know it hasn't been very long.

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