Definitely pick up Taking Charge of Your Fertility by Toni Weschler. It's my TTC bible! You can get a Basal Body Thermometer at WalMart or Target for around $10. You can temp either orally or vaginally. If you are a mouth breather though, you will find that vaginal temps are much more accurate.
It's very important to temp immediately upon waking, before moving, getting out of bed or even talking (if you temp orally). you have to temp at the same time every day, and you need to have a minimum of three hours of sleep before temping.
I also agree with the PP, the charting course on FF is very helpful though if I remember right it's is aimed more at people who are TTC. I think you can handle it though. I'm sure you realize that you need to do the opposite when it comes to BDing when you have fertile CM.
Good luck!