There is information on various types of birth control here
Womenshealthandpleasure.Com/
it doesn't however cover charting or the nuva ring (yet)
for the best help with charting and free online charting facilites have a look at Fertilityfriend.Com
you can plot you bbt, cm, and many other signs to keep an accurate check on your fertility
however natural family planning should only be used by women for whom pregnancy would not be a problem.
The pill is fine to use for long periods of time and if you aren't looking to get pregnant then the best thing really would be to stay on the pill. The dosages are so low nowadays that they really are one of the best forms of birth control