There is another thread HERE, about what you would do if you knew you were going to start TTC soon. It got some good responses.
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To chart, I second the pp's recs for TCOYF. Get it immediately and read it well. I also second the rec for Fertility Friend. It's free and really helpful to keep track of your charts as well as giving you a second opinion about your ovulation day. Plus you can share your charts here to get more opinions. :) BUT, I would not rely on FF as a sole source of information, I highly recommend learning the rules of charting by reading the book. How old is your dd? Are you still nursing, co-sleeping, dealing with night wakings, etc.? If so, charting will be especially helpful to see if you're ovulating and have a fertile length luteal phase. While charting can be a bit more of a challenge in this situation, it's still totally possible to see a pattern.Â
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You should start taking a prenatal vitamin if you aren't already and you could cut out caffeine, alcohol, etc. Same with your dh! :) Also maybe examine your diet and see if anything needs tweaking for optimum health prior to succumbing to morning sickness.Â
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Maybe read some books on tandem nursing (if you're still nursing) and Siblings Without Rivalry while you still have the time and energy to read! 
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Oh and start an exercise routine so that you can more easily continue it while pregnant. And think about things you wish you had done/known about the first time, how you would like things to be different, etc. and start researching and looking into your options.
Edited by Jaimee - 5/14/11 at 8:20am