Where do I start?

Jessica
I'm new to the whole OPK deal and trying to get to know when I'm ovulating and exactly when to "start trying ". We have been winging it for about 6 years now and mother nature hasn't taken her course,so we've decided to try a few things before going to the doctor. We went to cvs to grab some vitamins that I've seen on an earlier post as well as a specimen testing kit to see if it isn't the boys having difficulties. Getting serious about ttc is a little nerve wrecking but we're trying to maintain our cool. If you ladies have any suggestions I would greatly appreciate it. My cycle is about 40 days, according to the directions it said to start testing 3 days after my period, I saw a faint line tonight (which again the pamphlet said that's a no) here's to hoping we get on the right track!