I'm pretty much where you're at, in a new house and newish to gardening other than container gardens and looking for tips too. We lucked out and had the garden spots already setup. I'm horrible at guessing size, but I think our area is about 1/2-2/3 the size of a 1 car garage, and about half is fallow right now.

What are you going to do with your extras? Give away, can, freeze? That sounds like a lot of squash, don't those things kind of explode with fruit? Unless you do the stuffed squash flowers things.

There are three of us at our house, and I'm going to go overboard on the tomatoes and green beans because I can can those (dilly beans - yum!). We need to pick up a freezer (I'm guessing) for the non-cannables, like corn on the cob and anything I can stir fry. I don't like mushy veggies, so I don't want to go overboard either. Right now I have a spot that about 1.5' wide and about 4-5' long that I'm going to put a few peas (like a couple in 4 spots where I'll set up poles to climb on, like a tent), and then split the rest of the room between carrots (many), beets, turnips and a couple lettuces.

I'll definitely keep an eye on this!

Another newbie (first growing season in our new home but have been gardening in containers for years!)

First decide what method you will use. Will you use square foot, potager, hill, rows, what?! Then you'll know how much space you need. Also, with that much your first year expect some success but also expect some failure.

I would start with a semi square foot/potager design because it's good in urban spaces. Good luck

Looks like you have plants for year around or 4 seasons in Ga. I think you should read "Square Foot Gardening" by Mel Bartholomew. He has a good map for space of plants & when to plant. Beans,spinach 4"x4",beets & carrots,radishes,onions 3"x3",
Broccoli,cabbage, cauliflower,eggplant,pepper,12"x12".
Tomatoes 24"/2' square.
Just some of his work.

Looks like you have plants for year around or 4 seasons in Ga. I think you should read "Square Foot Gardening" by Mel Bartholomew. He has a good map for space of plants & when to plant. Beans,spinach 4"x4",beets & carrots,radishes,onions 3"x3",
Broccoli,cabbage, cauliflower,eggplant,pepper,12"x12".
Tomatoes 24"/2' square.
Just some of his work.

I would ask some questions before getting to far along I see this post started back a bit but... is this a open area or is it shaded by the house, tree, etc? Corn is wild pollinated so it would be better (critical mass) to have a larger area with several rows or be less organized and do a honey comb pattern and as the corn gets say 3 1/2 feet high plant acorn squash or vine beans with them as the corn is harvested you get the beans climbing the corn for support. That is alot of summer squash for two unless thats zuchinni and summer(yellow) squash. Placement of plants is tricky cause you want to rotate placement next year and you don't want to shade short plants with tall plants. Raised beds you dont have to leave walk room but you will in a traditional garden that said if your renting you wouldn't want the expense of putting in raised beds... we have 400 sq feet of raised beds which provides for two with some for storage. I am planning on increasing that size next year as my kids get older and eat more. I would venture that this would equal about 600 sq feet if you had to leave walk ways. I do use poles for beans and trellis for cucumbers, peas, watermelon, and pumpkin. I would also add watch what you can double crop potatoes and peas will be done in time for you to put in pumpkin and late beans this will cut down on space you need. Carrots planted next to tomatoes can also be pulled for young tender carrots before the tomatoes tower over them might also want to look at planting borage and marigolds they help with pests and encourage pollinators to visit. One last bit of advice no matter how many years you do this you will always be new to it set aside a small area to try something new every year purple carrots, artichoke, peanuts, white pumpkin, asian greens, or funky color beans you will learn maybe find a new favorite vegi but more than likly you will just visit the garden more often and take better care of everything.
Best of luck