Michael Snyder has a great post this morning explaining what happened in Iowa last night as far as the Republicans go, and where this might lead. He also explains how the electoral process works.
As Snyder points out, the 'average' Republican doesn't actually get to pick their nominee, so Republicans are a long way out from knowing who will be the actual nominee.
Disaster For Donald Trump In Iowa And The Probability Of A Brokered Convention Just Went Way Up
And this from Conservative Papers:
Things to know about delegates at stake in Iowa caucuses