First time using opk

It's my first day using opk strips first one at 11:15 am and there was a very faint second line I just want to know when should i do the next one I heard that you should test am and pm every day untill both lines are equally the same or second line is darker that control line is this best to test 2 times a day so I don't miss ovulation and also if I get a good positive how long after will ovulation take place ?