We've only recently got an Aga too and I'm just using my usual cookbooks but referring to the Mary Berry (?) book which came with the Aga to get an idea of oven and shelves and then just experiment and write it down so as I remember next time! So far my only disaster was my first casserole which was really chewy after 5 hrs but it turned out I'd a problem with the oven and it was 90 degrees below the temp it should've been !
Are you enjoying cooking with it? I'm loving it - am a real convert! Bought some aga cookware and it's brilliant quality so a real treat!