i was just wondering if someone could help me?

I want to start charting my cycle.

All i do now is track my period, which is 28days inbetween each cycle, sometimes less if AF decides to pop up unannounced..

I've only read up on charting my temp. is there other ways? or is charting my temp the best way? and how do i tell when O is?? ive also read up on the ovulation thermonmeter(sp?) Are they good??

I'm not TTC atm but down the track i'd like to know how and maybe knowing how to do it might help me down the track..

Thanks in advance