Here is a quick round up of some of my favorite gardening books. You can find out more about each of them by clicking on the one you are interested in. I have personally read all of them and so many more but these are the books I own and refer to the most. "Carrots Love Tomatoes" and "Garden Primer" are the two I use most often. The others were really helpful when I was learning more about gardening. There are a few about cut flowers too. I like to grow flowers with my veggies as companions which you can learn more about in "Carrots Love Tomatoes".
If you are looking for inspiration "Gardenista" is the book that might give you some ideas for planning and planting a beautiful outdoor area. "Animal, Vegetable, Miracle" is the true story of Barbara Kingsolver and her family growing all of their own food for a year. It's my favorite motivation book!
Personally I think you should read them all and any other gardening books you can get your hands on. I used to go to the library and check them out by the stack, scan every book for anything I had questions about and keep notes. I've kept gardening notes since the very beginning and I still refer back to them when I am unsure about something. It's also helpful to keep notes to remember where and when you planted things so you can figure out what works for you and what doesn't.
Hope you find something you like!