Posted: 26/09/2015 at 17:50
I'd second Ceres advice...........starting seeds off too early is a waste of time unless you have artificial heat and light.
You might want to consider making a hot bed in part of the g/h.......very useful for cuttings as well as seed. They can be more economical than a basic propagator but you will need to insulate well.
There is still stuff you can do in the G/h in January..........making up your potting/seed compost, over wintering some of the more tender stuff, or even having a cuppa whilst you survey your new domain
I've had g/houses from 50 feet x 20 down to 6 x 8 and have used and enjoyed every inch. I hope you will have the same amount of pleasure from yours