There is no reason you can't get great results if you spend time reading these:
http://boards.cannabis.com/basic-gro...-dankness.html
http://boards.cannabis.com/basic-gro...ency-baby.html
http://boards.cannabis.com/indoor-li...uch-light.html
http://boards.cannabis.com/indoor-gr...-progress.html
http://boards.cannabis.com/grow-faqs...large-pot.html
http://boards.cannabis.com/grow-faqs...-training.html
http://boards.cannabis.com/grow-faqs...ce-plants.html
http://boards.cannabis.com/grow-faqs...n-harvest.html
actually everything here:
Grow FAQs - Cannabis.com Forums Message Boards - Medical Marijuana, Cannabis Club, Dispensary, News

There are hundreds of different things you can do to maximize your yield... and most of them have already been written up in complete detail. I know reading sucks sometimes :rasta: