My first Sourdough bread

I've been nurturing a starter from a friend since Tuesday and today I've finally had some success with bread.  This loaf was about 24 hours in the making and required a lot of kneading.  I added the salt in a step too soon so I'm wondering if that's what caused me so much kneading and I still didn't get a windowpane.   It was good though!  I'm going to need to figure out a better way since I had to get up at 1AM to shape the loaves due to my getting a late start!   I also need to figure out how to score the bread better, my serrated knife did nothing.