i know alot of us younger guys have tons of questions when it somes to billing, contracts, installs, and the list goes on. may i recomend that you get involved in some of the green and grow shows and sit in on some of the seminars. i went to my first today and i learned a good bit when it some to actually recouping the cost of operation. not only do they talk about this stuff, they cover alot of other aspects of the green industry. so if you can make a point to go to these things. doing so will help you in more ways than one and you will capture the true cost of operation.