You can get books through Barnes and Nobles or Amazon..you can also
take classes if they teach 'em at your local community college...just
go online and do research...asking questions is a good 1st step..
If you want examples of some things you can do...
a. you can build the building green: that's when the building is positioned to gain max exposure to the sun, collects rain water and recycles water, has a green room where herbs and some vegetables are grown.
b. there's energy saving electronics i.e solar, wind, recycling use of sun light...etc
c. transportation: carpool system, offer free bus passes to employees..
good luck that should get you started :)