the book 'Taking Charge of Your Fertility' by Toni Weschler (as per sticky at top of forum) is very comprehensive and covers all the things posted above and more.
You can find more info on
www.fertilityfriend.com - it's a charting website, but you can read the helpful info without having to take your temp, and then decide whether it's worth it for you.
If you always have very regular cycles, you may not want to bother temping or using OPKs for the first 2-3 months - say you always have 30-day cycles, if you BD every day from day 12 of your cycle (counting from the first day of proper red flow of your period) to day 18 of your cycle, you *should* have covered your bases as far as ovulation timing is concerned. If you don't conceive after a couple of months following that timing, or if you have irregular cycles, then OPKs and temping really help.
For example - I usually have 33-day cycles, and ovulate around CD(cycle day)18-21. I had a chemical pregnancy in October (very early miscarriage), and because I was temping, I knew that in November I ovulated on CD12 - a week early. So when my period arrived a week early, I was expecting it. Similarly, in December my temps told me that I didn't ovulate at all. I was able to take my charts to my doctor who confirmed that the chemical pregnancy had messed up my hormones and said that because I had all the data, he was willing to start investigations at the end of the next full cycle if I haven't conceived by then.
If you want to see what charting looks like, follow the link at the bottom of my post - or anyone else's, if they have a fertilityfriend.com link - and you will see how you record cervical mucus (cm), ovulation test results (on my chart OPK for sticks and Mon for the Clear Blue Easy Fertility Monitor) and intercourse timing (BD) on your cycle. On my chart for October you can see that the monitor and the cm helped us to time intercourse just right, and we conceived. On the November chart you can see that the miscarriage threw my hormones out, bringing ovulation forward and taking us by surprise (though thanks to the cm and the monitor, we'd BD'ed early too, so were still in with a chance), and on the December chart, which is still continuing, you can see that the monitor, OPKs, and cm all told me I wasn't about to ovulate, and the temps confirmed that ovulation either didn't happen, or if it did, was very weak - there was no definite temp surge.
Hope that helps!
the EWCM is the most fertile type and you should try and get you BDing in when you have this.....although be warned it can last for over a week so don't waste all the good swimmers in the first couple of days. As soon as you've OV'd the CM should dry up again although some women do get creamy or crumbly CM as AF gets closer. 
