I'm not a super expert (I know in general how to chart, but I don't do it), but here's my understanding of things:
EWCM indicates that you're fertile. Not that you're o'ing that moment, or even that day. You may get EWCM for a couple of days before you o. (You may get it at a couple of other random points during your cycle, too - if you're using cm to check fertility, you should also pay attention to the position and feel of your cervix.) EWCM should decrease after you o, but it can't really tell you exactly when you'll o.
Toni Wechsler's "Taking Charge of Your Fertility" is really popular around here, and not faith-oriented.
As for charting and temping, you'll find a lot of info about that in the Wechsler book, and you can also register at FertilityFriend.com for their free 20-session class. You might want to start before you begin TTC just to get a feel for it and see what your cycle is like normally. I'm not sure where you are in your cycle, but some people (most people?) recommend starting your chart on the first day of your cycle (ie the first day of full menstrual flow). Starting in the middle of your cycle will give you an incomplete chart, and the information may not be as useful - especially if you want to have a "normal" chart to measure your "am I pregnant" charts against.
Hope that helps, and good luck!
N,: Wife and Wannabe AP Mamma. 11/08. 9/09. Wishing for a , but wondering if I should.