Hi Beanie and welcome from me too :)
I was told that to grow in a greenhouse you really only need heat and light, not necessarily full sun. My father-in-law has his on the north side of his bungalow and he always gets fabulous goodies from the greenhouse. He does have lots of room all the way around it plus there are no over hanging trees etc, so lots of natural light.
Like manics said, everyone had problems with greenhouse growing last year. Don't be discouraged. This year is going to be much better.. It's a leap year ;D
Lauren