Starter Schedule - Missed a few days

Toast

I am building a starter from rye floour and I made it through day 5 without interruption.  Unfortunately, I was out of town and missed 3-4 days.  The starter seemed to be progressing nicely, it smelled and looked just like the book said it would.  Can I just pick up where I left off or should I abandoned it and start a new one?

Your starter sounds OK, just keep feeding and discarding.  As long as it smells and looks OK, no need to stop.  But if it starts to smell unpleasant or there is mold, it's time to start over.