Hello and welcome 1982paul,

The first thing you need to do is read up on basic horticulture, so you understand what a plant's needs are, from the aspect of photoperiod (when it get's light), temperture and humidity.

While greenhouse growing sounds great, it's major advantage is a controlled enviroment, you still need the three basic elements mentioned above.

If you are just starting a grow now, I doubt there is a long enough photoperiod right now to be able to be successfull with your vegative growth phase. And you my find when you get to the flower stage the photoperiod is too long. Both issue's could be addressed, but not easily. Plus to control temps you are going to need that greenhouse heated, very expensive.

To get a better idea of what and when you can grow, check out a commercial greenhouse operation in your area.

Good luck
OM