Ok, so here is what I remember and if you PM me your email address I can send you a scan of some instructions I have.
First you start with charting your cycle. You want to have a three space section for each day and you want different color stickers (lets use red, green, and white for examples). So for each day you will have a space for the date, a space for the vaginal secretion of that day, and a space for the sticker thats color coded for that day.
For days when you have your period, use a red sticker and put "menstration" for the vaginal secretion. THe beginning of most women's ovulation cycle starts shorting after the menstration stops. For most women the MOST fertile time is the time directly after the menstration cycle. The Dr. who taught this class said that she suggests have sex every day during the time frame (if possible) for couples TTC.
What you are looking for is that your body secretions will progress from (at the vulva only) dry (infertile and green sticker)