Click the 'build prefecture button and instead of left clicking in somewhere constructible right click on a square established by a house; that will infect the house with disease.
Depending on how good your farms or your trading posts are doing you can add more warehouses; that way you will store more surplus.
Or if there's more than one product coming into them you can add other types of products if you add more warehouses.
Type tarmac and then type these codes:
chrisedwards: All weapons
arloeisenberg: Full Life
bhardin: Invicible barriers