What is the approximate weight of a B & B tree?
The weight of the tree is based primarily on rootball size. A good estimate would be:

Rootball Size       Approx Weight
28"                        380
32"                        450
36"                        800
40"                        1000
44"                        1500
48"                        1700

What is a proper planting and watering schedule?
The University of Florida has published an excellent report on planting and irrigation:

Specifications for Planting Trees and Shrubs in the Southeastern U.S