Will not turn over after replacing water pump

First, car was over heating so I changed my thermostat sensor, next I changed the thermostat housing unit. After doing this I found out my water pump was bad. So we go in swap out everything gaskets, grommets, water pump the whole nine yards. Now that the new water pump is in and we bolted everything down made sure everything was grounded the car will crank but will not turn over and start. What should I do next?