Week 8 how to setup tips building 120 sq ft polyethylene greenhouse?

I have a 10by12 7ft height polyethylene cover. It says it's a hot house?
What do I do for a floor
Wind
And is that enough light to put 8 week old veg outed plants.
Just transplanted about 20 inches tall 18 wide
Feeding 5-1-1 fish fertilizer and using happy frog as a soil. I'm gonna need to put them in a forever home out in a wide yard. What . Is this tent ok for plants all day stored
 
Does it need a floor? Or can I put the plants right on grass inside? And it has 2 doors you can roll up and windows that zip open. I'm gonna run a fan down the middle. Any tips on how I shld arange 12 plants with 3ftx3ft space for each plant. How zhld I arrange the rows and the doors towards the sun shld long way face south or north? Shld I set up 3 rows with 4 pots each row. How shld the greenhouse be set up facing with way?
 
How shld I trim these its week 8 blue dream seeds in cup first than 4by4 square than 3 gallon now 5 gallon pots they were topped at 5 nod but now I need to clean up bottom of plants and what about the huge fan leaves on a thick branch blocking the sun to bottom an inside can I trim those upper huge fan leaves on branches?
 

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