N.B.
Hi E.,
my son was 11 mo when we started sitting him on the potty. Good choice - i found the baby bjorn to be the best one. when you're ready to graduate to a toilet training seat, stick with baby bjorn - i found it to be the most stable and my son never peed over the top.
the only book i read was "diaper free by age 3", and i still refer to it from time to time. when my son sat on the potty, we had our favorites (like goodnight moon - go figure!), and i felt like sometimes he just wanted for us to get that book out and couldn't go until we started reading. when you start this early, going to the potty is just something you do, not something you have to learn.
a few tips:
i would agree with the previous poster to try to catch pee/poop first-thing-after-sleeping AND after meals.
and try to have a word/sound/sign associated with the action. i never had luck (and still don't - my son is 22 mo) getting him to tell me when he has to go BEFORE he goes, so i know it's up to me to keep an eye on the clock and on him - if he's had a lot to drink he can pee every 30 minutes, if not then he can go for 2 or 3 hours. you may have better luck, so definitely try!
when YOU are ready, i'd recommend switching to underwear. my mom (my babysitter) was so paranoid of accidents in public that we kept switching him back and forth from underwear (at home) and diapers (outside). (btw, we use cloth diapers). after a full day in diapers, he would have more accidents at home for the next day or two. once we switched him full-time to underwear - understanding that accidents in public will happen (so we always travel with more changes of clothes than we could possibly need) - he has been much much much better! we made the switch to underwear all the time about a month ago and these days we can spend an entire day running errands, and no matter how tired he gets he almost never has an accident. honestly, tho, i feel like my son learns from his accidents; the first time in his stroller in underwear we had two accidents two days in a row, and never since then. the first night he was out-and-about in underwear he peed through 4 pairs of pants in the span of 6 hours, and almost never since then (once, but he was very distracted/involved by exiting new toys).
also, now that he's so young you need to sit with when he's on the potty to keep him entertained there long enough to go. however, there may come a time (it did with my son) when my being there became more of a distraction, and i felt he wouldn't go just so he could get undivided mommy-time. this happened when he was maybe 17 months, so keep an eye for those signs. you can then start encouraging him to do it on his own, or simply say that you need to do something and will be right back.
that was probably more than you asked about.
in short, i think it's great that you're starting now. my friends with older children are having the hardest time re-training their children NOT to poop in their diaper behind a sofa etc and have to bribe them (with stickers etc). just try to be consistent, know that accidents will happen, and be prepared for this to take a while (and the responsibility for knowing when he has to go is yours).
good luck!