Don't put food and water inside the housing, not enough room, the water will condense and make the chickens wet which in winter will freeze and cause frostbite. They don't need it inside anyway. It's only an area for sleeping. The nesting area is not to be counted as living area. I have a similar, ever so slightly larger coop. Mine holds 3 according to true standards of 4x4 per bird. Manufacturers say 8. I promise, manufacturers lie like a politician. Turn the whole thing into a living area by closing it all in which will give it roughly 12 sq ft or so, a bit tight but possible for short term. Raise it up on bricks or concrete blocks to prevent wood rot. Look inside to see where light shines through and seal it BUT do not seal the vent! When enclosing it all remember to leave vents. Vents are not drafts. Vents are open areas ABOVE their heads. Lots of info on this site about that. Close ALL doors at night. Predators are most active then. Screw a 2 foot wide apron of 1/2inch hardware cloth around the base to keep diggers and snakes out. Attach a run giving them 10 sq ft per bird. That's about a 4x10 area for your 4 birds. It's better if it's a bit wider so I'd go with about 6x7. Too narrow and critters can reach in through the fence. And for that you cover the run in that 1/2 inch hardware cloth with the same apron. If you have hawks, owls, raccoons, or mice you want to cover the top of the run the same way.
And then there's chicken math. Start now building a bigger-than-you-think-you-need coop and run. You WILL want more birds! I started my flock of 4 in November. By March I had 7. I've got my eye on several more.
Don't get overwhelmed and discouraged. It's all worth it once you know they have a healthy and safe home and can relax and enjoy them. Use this place for help, advice, and encouragement.
