If you are new to a technology, you might want to have a place to get you started. It would be great if can be free and can guide you through from beginner to expert. Microsoft Virtual Academy can be here to help, if you are going learn SQL server, you can find their link here. This would be a good place to get you started, if you want get more details on SQL, you can go here for online training provided by SQLSkills, which go into details on different aspect of SQL.
This should be able to guide you through the journey of DBAs
This should be able to guide you through the journey of DBAs