Hi & Welcome
The Ubuntu/Linux Bible is a very good book.
The "Linux In A Nutshell" is also a good book as well to learn from.
You can also learn a lot from reading posts, tutorials and articles. Also;
Depending on where you live there are Linux groups that meet once a month at local library's, meeting halls etc. Try using google to find your local group if there is one in your district.
There are other Linux's books on the www.ebookee.org