@Silok

Re: "Only one question after the deleting the reserved space did not go down, it was the same as before any reason for that?"

I'd strongly suggest reading the manual. If you're responsible for a production SQL Server, you absolutely need to know the basics. Challenge yourself to at least research your question before you post. Querying the forum for the simple SQL Server questions you have could very well be a point of discussion with your boss at your termination.

http://msdn.microsoft.com/en-us/library/ms189493.aspx

BTW: I'd encourage you to start with the database backup and recovery topics.