Bruges is famous with Gothic Architecture. Look for big , thick , Belgian Gothic books and learn where you can hunt for photography.
I found there were many books on Belgian Gothic at my university and they were matchless.
I think carrying a SLR with a power tele will close you to document atchitectural details and fill the colummns fill the frame. If you can rent a Leica , you could be the happy man if you are interested in dıocumenting quality with quality.
Belgium have a extremelly wide palettes of beers and learn the list of oldest and best abbeys to taste and photograph the environment.
They have extensive needle work tradition and you can want to document it.
And their philatelic history is so great.
Instrument museums and art museums are worth to document interior decoration of a Ruckers clavichord or photograph a Bruegel the Elder.
I dont think you can have time and oppurtinity to take these masterpices details and prepare some money to acquire art history books . I dont think your photographs will match with these catalogs.
If I were you , I put my expensive air ticket money in to buying books. It will take couple of years to learn their history , art history , traditions , language , literature and than you can make your trip.