Greenhouse for a newbie :) (it's me)

Alisina, I think you first have to consider where your new greenhouse is going to be and what the it's going to stand on, i.e. slabs, grass, soil, etc, then think about the weather you're likely to get (especially if you opt for plastic covered frame type and you're in a windy area), then about how big you can go and the budget you have.

I don't know where in UK you are but that might influence what has to grow undercover. The usual greenhouse crops are tomatoes, cucumbers, chillies, aubergines and other semi- tropical plants, but some of these will grow outside in a warmer climate. Some of us with several greenhouses grow all sorts undercover. I think your cabbages would be best outside though

There will be others along soon, I'm sure with more tips.