Try "Enjoy the Recorder" Books 1 and 2 for Treble Recorder by Brian Bonsor, published by Schott. (Make sure you specify treble as there are descant books as well). These are designed for older children and adult beginners. This will take you up to 4 sharps and 4 flats. After that you should be reasonably competent to carry on yourself. The Dolmetsch website is brilliant - it includes on-line lessons and an excellent theory section, working up from basic to vary advanced (useful for any musician, not just recorder players.
Also look at the Society of Recorder Players' website -
Society of Recorder Players for lots of general information, recorder sales, courses, and details of where your nearest branch is for when you are able to play rather more than you can now.
You don't say what age you are, but Benslow Music Trust at Hitchin
Benslow Music Trust do a course called "Learn to Play the Recorder in a Weekend" from September 17-19 2004. The Trust caters for adults, but they will accept young people if accompanied by an adult. They also do a weekend for beginners who are slightly more advanced.
Good luck with improving your playing - there's plenty going on in the recorder world and a lot of fun to be had once you are competent enough to play with other people.