To start with, I think ...http://www.learndatamodeling.com/   will be helpful for the data modeling and other general concepts.  For SQL server 2005 resources, you can follow the following links-  http://msdn.microsoft.com/en-us/library/ms130214(SQL.90).aspx.

http://technet.microsoft.com/en-us/default.aspx

There are lot of  other resources on the net. The only thing I could suggest is- don't go for many resources in the beginning, as the chances are very high that you could get confused. Just follow one  or two resources  in the beginning. 

Hope this will help.