Any good links for an overview of tracking?

I want to start tracking next month. I played with OPKs once, but I'm pretty sure I was using them wrong. (When we were pregnant, the dates didn't like up by about a week.) I have a thermometer and a pocket calendar to record temps in. And I know the basics of CM (egg whites are good, dry is bad, white/creamy means O is past.)

Does anyone have a good link that talks about temping and OPKs? I'm looking for things like what time I should test, how accurate is the temp if I was up in the middle of the night with my kids, how long to hold urine before taking an OPK. The list