Another way is to search online for military history fiction book clubs or forums. There, you can find discussions about various books and which ones are good for beginners. You can also find out about new releases. For instance, there are many forums where people discuss books set during World War II like 'The Nightingale' which has a female - centered perspective on the war. This can give you a wide range of options to start with.
Ask for recommendations from friends or family who are into military history or reading in general. They might suggest books like 'The Red Badge of Courage' which is about a young soldier's experience in the American Civil War. It has a lot of psychological insights into what a soldier might go through. Then you can go to your local library or bookstore to get the books. Start with books that are more accessible in terms of language and story - telling, like some of the more modern military history fiction works that are written in a more contemporary style.
You can start by looking at best - seller lists. For example, 'All Quiet on the Western Front' which is often on such lists. It gives a very real and tragic view of World War I.