Hi Narrawallee good to hear you are interested in learning yoga. I'm the Yoga editor here on BellaOnline - if you click the link under my name it will take you to my site. There is lots of information about how to start, how to do postures, sticking with your practice and lots more.
Dr Ilyssa's advice to find a class is a really good place to start. If you're nervous about going to a class then a yoga dvd that you can do at home is also a way forward. Having a teacher is very beneficial so they can tell you if you are doing the posture correctly and advise on specific exercises for you.
Good luck starting your practice. Don't forget we're all here and can support you through the forum and the articles posted each week