How did it go? I bet you felt great afterwards.
I was nervous before my first yoga class too. It was Iyengar Yoga and I didn't have a clue what to expect. At least the school's brochure told us what to wear: bare feet and comfortable, close fitting clothes. I prefer yoga pants and a fitted tee or tank.
I sure was sore after the first few classes! I had no idea that yoga required so much strength. Do your muscles ache?