Dabu, this isn't really an answerable question. There are so many variables that really the only answer is 0-500+ grams dried. We know nothing about what strain you're growing, if its indoors/outdoors, types of lights, ferts, area, weather, pests, etc....... Even if we knew all this it would still be up in the air.
From the sounds of it you need to do A LOT of research before starting your grow. Check out the grow faq and read numerous threads.. even reading stuff that may have nothing to do with your particular situation can often answer a question you may have. Good luck!