Hi Feezle,
Questions: 1) Do I SOG or SCROG them? 2) when do I think about flowering?,

I had the same situation when I started so I would give you my advice in this but please, do not take me for granted as I am a Newbie too.
ScrOG has a lot of work above and bellow the net, but two things that I like about ScrOg is that you do not need so many plants to cover your grow area. And for the space you currently have 6´L x 3´D, 10 plants are more than enough in ScrOG (you can even lose one or two more plants, and it is not going to be a problem, you let the rest to veg for a little extra and you will cover your grow space).
If at the time of 12/12 you have 10 plants you can let them grow at canopy space about 1,5´ each plant and this will yield you more than SOG in the same space and with the same number of plants. One more thing, you have a height problem (4`) and your buckets and light housing will eat at least 1´, so these two factors will make me get into ScrOG without doubt
I am adding two pictures of my current grow, so you see that I had the same height problem when I started so I went ScrOG. In the second picture you will see I have 10 plants under one net and 9 plants in the other (each net has 10´L x 3´D)
I hope this helps you
Peace