First attempt

It sounds like the fermentation is well on its way. Everything you're seeing is completely normal, and in fact is the ideal situation. Sometimes the yeast has trouble getting off to a good start but it appears that you do not have this problem.

Hydration is a good idea, but not completely necessary. Yes, it looks like the yeast was so hungry, it got started right away, which is a very good thing. It won't be long until you've got your first finished beer! Hope it turns out to your liking.