Its grams per watt, people who don't know what they are doing usually get .2- .3 grams per watt, someone with a little experience .5grams per watt, a good grower using hydroponics can hit 1.0 grams per watt, and the world renowned growers have hit 2.0grams per watt on few select grows with correct strain. you also have to take into consideration the amount of weeks to finish (flowering time)
Hate to break it to you but you are a serious amateur if you havnt even seen a 1 pound plant indoors.

There is a link in the 100% confused thread, with like 20 books all on cannabis cultivation.
good luck learning to grow bro