It sounds like you have a good plan. To fill up your beds, I would find a bulk materials/landscaping yard that will deliver a few yards of compost or planting mix. You'll probably want to add vermiculite to that. You may also have time to make your own compost. If you have dry leaves, kitchen scraps, etc, laying around, pile them up with some manure, and it should be cooked by the time your summer vegetables are ready to go in. There is another thread in this forum on where to get compost materials.

As far as positioning the vegetables, remember that you'll want to allow enough flexibility to rotate your crops in the following years. Also, some shorter crops might appreciate some shade, like lettuces. I am planting my lettuces in a round bed that will have a pole bean teepee, so that they will have shade as it gets hotter and the beans grow.

The sun is so far north, west and straight up during the summer months that I find that shading is not a problem. In fact, my garden gets more sun from the north-west than any other direction. IMO, the whole hullabaloo about southern exposure is a myth. It simply doesn't apply from May through September - prime growing season for the US. I suggest you look more at trees, houses and other structures surrounding the garden to see where they are in relationship to the path of the sun.

Kay.

I'd also check with local nurseries to see if they'll deliver a yard of compost or whatever you need to fill the beds. As far as the layout, it sounds great. Corn is tall so I think putting it in back would be fine. But peas are an early crop, so it depends on what is going in front of them as to whether you want them in back. Mine are usually along an edge so that once they're done for the year, larger things like tomatoes and peppers can expand into the area they grew in. Do you have a shadier area or do you expect to get about the same amount of sun in each area? I'm surrounded by trees in other yards, so do a lot of my planning keeping in mind that sun varies with their leaf growth over the summer.

It's going to take more compost than you think to fill those beds.. Let's say you want the beds to contain 1/3 compost and 2/3 other materials.* You have 6 beds, each 3'x8' and you want 3" of compost in each bed. Basic math tells us to multiply length by width by depth; in feet that's 6 beds of (3feet)x(8feet)x(.25feet)=6 cubic feet per bed, or 36 cubic feet. A yard of compost is (3feet)x(3feet)x(3feet)=27 cubic feet. So buy (or make!) two yards of compost, either add a bit more compost to your beds, or make other plants very happy.

Speaking from collective Soil/Compost/Mulch forum experience, be wary of buying "soil" (as opposed to the compost or planting mix recommended by Lantanascape. Most purchased soil is the crud scraped up by home builders and is no better than fill dirt.

Harimad
compost & math fairy

* Pure compost isn't ideal for all veggies. Mel recommends 1/3 compost, 1/3 vermiculite, 1/3 peat. Myself, I'm not a fan of peat: it costs, it's not easily renewable, it's inert. I use soil instead. **

** I'm not an expert veggie gardener but I'm pretty good with soil. Come on over to the Soil, Compost & Mulch forum to learn more about soil and compost.