
The Internet is probably the best place to start. There are hundreds of sites on yoga, many offering excellent advice on yoga for beginners all for free.
Chat rooms, online forums and chat lines are also a great help for beginners who may meet other people asking the same questions as you. Also the Internet is also a great place to purchase yoga equipment. It is often much cheaper than high street stores and of course no hassle with crowds of shoppers or travelling miles to specialist stores. You will probably need a yoga mat and a yoga ball to start out with and later on further resources such as blankets, slings and blocks to assist with different yoga postures.
Books are another excellent resource to draw upon as a beginner, again use online bookstores to buy. There several good books about yoga specifically targeted to helping beginners get started with their yoga. If you are very keen you may want to buy your books, but why not pop down to your local library to borrow initially before buying. They will probably have a few DVDs that guide you through the initial postures and steps of yoga. Then is you like them you can then buy them.
A good book will give lots of diagrams and pictures giving you easily understood written descriptions of different postures. Good books can also give advice on meditation and breathing techniques.

There aren't many things that relax you and give you the benefits of mental therapy as yoga, which is why it has and continues to be as popular as it ever was.