Tube sites/books, recommendations please

After spending my audio life as a member of the solid state party, I am dipping my toe into the dark and mysterious world of tubes. I am purchasing a tube pre-amp in the next couple of weeks and am looking forward to doing some tube rolling. I am looking for any advice regarding either web sites or books that will help me get a basic education on tubes to get me started. Thanks so much in advance for any help offered...