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

I'm also not much help as I have inherited my greenhouse from the previous owner of my house so didn't get any say in what I was getting! However, one factor to consider is whether you want to grow in containers in your greenhouse, or want to grow in the ground. I would prefer the latter, but my greenhouse is set on paving slabs (probably the only real option here, as it's also on a slope) so it's containers or nothing for me.