haha there is no way to know man... it comes down to the basics... you need money spent to get BUD. If you barely pay anything, this is your first grow and you don't know much and don't plan to study up... then you may get a few grams... if your plant doesn't die...On a low budget grow 18/6 veg then onto 12/12 flower with cheese strain, no major cost spent, jus using standard stuff (indoor grow), on a rough estimate how many GRAMS/OUNCES could you grow from 1 plant.
I was the same way man. Honestly if your going to continue to grow invest whatever you make off this crop into some cool growing equipment. Mainly lights.I was stoned and was thinking crazy forts that i may have loooads and what i can do with it all. lol i wanted to buy a new cat