Phew, quit a subject.
I'd start with a visual book. The best way to remember stuff is to visualize. You can then connect pieces of text to the picture and remember easier.
Or, you could try to watch some historically accurate movies and the like, for the same reason.
PS: In free time, some historically-based books might help too. Crusade in Jeans gives quit a nice discription of the crusade, for example. And it's a cool book to read.
PSS: Educational material like this might be available in your local library too. They're created to include most, if not all, elements of a certain time period.