They are in order, and Bond evolves based on his experiences in previous books. I would start with the first, Casino Royale and go from there. Bond of the novels is a more complex and less hero-worshipable character than his movie equivalent. My personal favourite is On His Majesty's Secret Service - I also loved the short story A Quantum of Solace (which has nothing to do with the movie of the same name).
And while I personally enjoy the novels, I will say that some of them have not stood up to the test of time as well as others, and now read as very dated. Not discouraging you from reading them, just be forewarned!
OHMSS is also my favorite. Out of curiosity which would you say have not aged well? Dr. No has some issues racially as I recall but not that I can think of as outright offensive. I ask because I want to know what I have missed (sometimes the blinders are up and you don’t see what you should).
And while I personally enjoy the novels, I will say that some of them have not stood up to the test of time as well as others, and now read as very dated. Not discouraging you from reading them, just be forewarned!