Greetings!
"A Chronicle History of Knights" Hopkins, Andrea; Barnes and Noble Book; 2004; Singapore; 192 pages.
This is a popular book, though well-written, and good for capturing paintings and pictures and concise descriptions of a day in the life of a templar, and other interesting things about knights, knight orders, and knighthood.
"The First Crusade" Asbridge, Thomas; Oxford 2004, New York; 408 pages.
This book is a scholar's work, and while precise and thorough in historical analysis, the book is well-written and accessible to the general reader, as well as being of interest to the scholar. This book goes into step-by-step analysis of how the crusade began, what it was like, and the whole scene of military exploits, battles, and sieges throughout the campaign, as well as providing incisive narration on the political environment of the Crusader States and the Muslim nations surrounding them.
"Dungeon, Fire, & Sword" Robinson, John J. Barnes and Noble 1991, New York; 494 pages.
This is a scholarly work, though quite accessible to the general reader. The analysis is good, with accurate descriptions and analysis of the various campaigns and personalities involved throughout the crusades. The work is detailed on the organization, training, tactics and equipment of the Knights Templar and other knights and warriors fighting in the Crusades. An excellent book!
These should get you started! Try finding them at the local library, or go search for them at your local bookstore. They provide a good mix of pictures, maps, analysis, and narration.
I'll write more later if you like.
Semper Fidelis,
SHARK