maleficent

Do you have to be very flexible/bendable? Nope, in time, yoga will improve your flexibility by tons.
Do you have to be very thin? NOPE Not at all, that's one of the good things about Yoga, it's a non jarring workout
Does a session last a long time? Probably 30 minutes or more
Can you practice yoga without going to a class? Yes, but a class is best to learn proper technique - so you don't hurt yourself, and it's nice socialization
Is it easy to learn? I'm a total klutz, but yes
Do you need a lot of space? Enough space that you can stand up with your arms outstretched and not hit anything -- same for your legs
Do you have to be in top physical shape? Not at all

Avon has a series of cards for yoga positions that are pretty good, it's got an illustration of the position, and what you should do. The set comes with 30 cards, and you can pick and choose your workout.

When you are doing your workout, you want to be in a quiet place, free from distractions, if that's possible, either use a yoga mat, or a cushiony towell, wear socks or bare feet and comfortable clothes, I like to have some music playing in the background and light a candle for some aroma.

__________________