If you going to learn SQL you will need database management program. You can download SQL Server 2012 from here :
http://technet.microsoft.com/en-gb/evalcenter
Install and you are ready to go.
Here's an install guide from Microsoft for SQL 2012
msdn.microsoft.com/.../ms143219.aspx
SQL over on MSDN lists the help files
msdn.microsoft.com/.../bb545450.aspx
Tutorials for SQL Server 2012
technet.microsoft.com/.../hh231699.aspx
technet.microsoft.com/.../jj590844.aspx
technet.microsoft.com/.../ms365303.aspx
Offline documentation download for SQL 2012 here
www.microsoft.com/.../details.aspx
Hope that helps!