My first starter

I began my starter with 1 cup of 95 degree skim milk, mixed with 3 tablespoons of plain nonfat yogurt, stored at 90 degrees for about 10-12 hours.  It appeared to have a curd, so I mixed-in my 1 cup of flour, sealed the container and have been storing it on top of the fridge for the last 24 hours.

So far, it looks like I have some liquid separation going on, about 1/4 inch high.  But no bubbles.  My recipe says store it for 2-5 days, and I should see bubbles. 

Am I ok, or is this starter a bust?