Hey Kay,
You can make it with black tea or with a ratio of green-to-black of 4:1. I used black tea, specifically orange pekoe, when I was making it, but if I try again, I'm going to try the green.
Yes, it was effervescent. That's part of the fermentation that goes on.
Every week the "mama" mushroom, which is floating in the sugared tea in the glass bowl in the refrigerator, produces a new "baby" underneath. You peel off the mama and put her in your compost. You pour the tea into a pitcher to drink that week. You brew the new tea in a big cauldron and when it's cooled, it goes into the glass bowl with the baby. Over the next week, the baby becomes a mama.
It goes basically like that, as I recall. The glass bowl is covered with a cotton tea towel, cinched down with string or a rubber band. If for some reason you end up leaving the Kombucha beyond the time when it has got two layers of the same size, too much of the tea will disappear and the mushrooms could get dry and icky. That's what ended up eventually happening with mine when for some reason I was out of town or something. Also, there are various things that can cause them to get mold, but mine never did.
I got my starter mushroom sent to me through overnight delivery, in with some tea, inside a big Ziploc baggie, inside another big Ziploc baggie, inside some padding and then a box. It survived without refrigeration long enough for overnight delivery. And you can tell when you look at them that they look like a big round creamy colored blob of dough and aren't dried out and don't have any other colorations or difference in textures throughout. But then too, I got mine from a friend and I knew she prepared it properly.

Maria