Welcome to the forum Carolyn.....
i think you will find the best information will be on the internet, many of the better bird books are a tad out of date, though others may recommend some specific titles. Almost all of the bird magazines have fallen to internet readers.....when reading info on the net, keep in mind that a lot of what you will read has been extrapolated from somewhere else & adapted from the webpage you are reading from, without accreditation to the original author/source, so it's always best to seek more than one verification of the information.....even some of us who have been around birds 20 years or more scratch our heads about some of the info that's out there.....one other thing, just because it's sold in a pet store or on a bird related website, that does not mean it is good for or needed by your feathered friends.....
I'm on some 50 bird groups & forums & this forum is one of the best for prompt & friendly information.....much of stewarding a companion bird is common sense and what's best for the bird rather than what's convenient for you.....