Yup, read up on
www.fertilityfriend.com
That will help a lot. Basics:
Be sure you temp at the same time every morning (within 30 minutes). This means you'll probably have to set your alarm and use it to get a temp at the same time every day. Keep the therm close to your bed so you can just wake up and grab it. Don't talk, get up, drink, eat, or anything before you temp. Open your eyes and temp.
Just start graphing the temps... y axis is the temp, x axis is the day (usually cycle day, but if your cycles are that wonky, just start with a date).
Record anything unusual -- especially spotting/bleeding/periods.
If your cycles are so crazy, it could take a while (months) for you to figure anything out. And you may want to consider seeing a doc about it as there could be a reason for it.
Also, if you get the membership to fertility friend, then you can put a link to your chart in your siggie here. The ladies here are very helpful about looking at each other's charts and helping to make sense of them when they are asked.
Good luck.