Starting replication when establishing a connection is the default and recommended configuration. If replication is not started, data is not added to the queue on the source, and source/target data integrity is not guaranteed.
To start replication, open the Replication Console. Right-click the connection on the right pane of the Replication Console and select Replication, Start. After starting replication, you should perform a remirror to guarantee the source and target data are identical.