unless you can cover the greenhouse so the plant gets 12 hours of darkness it will not finish by june it will probably be late october or even early november if you cannot give it 12 hours of darkness.
as per growing inside you need decent lighting like a small metal halide or high pressure sodium, or some use flouros or several compact flouros if you are just going to veg it under it for a month and then move outdoors. and basic things like soil, perlite, pots.