New to Sourdough--some questions about my first try
New member here! This seems like a helpful community so I thought I would post some questions.
I have been trying the Tartine Sourdough recipe. I paged through the book and thought it might be too difficult, but then I saw this post  also with a link to Martha Stewart's site , and it looked easy enough.
The first night that I mixed it up it rose and fell. I discarded 3/4 and added flour and water. After that, I don't think I've had it rise and fall. I get this:
Here are my questions. Is it supposed to separate like that? If so, when I discard it, am I supposed to stir it up first and discard? I get the "stinky cheese" smell from it, but now I'm not getting any bubbling, nor a rise or fall.
Do I need to start over? What should I do to make sure I succeed? It has been humid here and a few hot days, though we usually have the air conditioner on--how much will that make a difference?