You mix the soil with whatever amendments you're using (compost, etc.) and then plant into that. You don't need to top it with anything except, possibly, mulch.
On the mulch question, I do use commercial compost as mulch. It serves pretty well for a year, and then next year I work it back into the soil and spread some more on top again. I don't like shredded-wood mulch.
What fruits and vegetables were you going to grow? I'll make some guesses and suggest:
Tomatoes, peppers, eggplant: Buy plants, grow in full sun.
Corn, cucumbers, pumpkins, squash: Plant seeds directly, grow in full sun.
Beans: Plant seeds directly, they'd like full sun but would tolerate some shade if you have no choice. Only three hours of sun is pushing it, though. Your shade area may need to be devoted to salad greens, and even they may struggle a bit.
Lettuce: Buy plants, will tolerate some shade. Seeds are fine later, but lettuce seed is a little tricky.
Carrots: Frankly? Don't bother the first year. I find them too tricky. But if you do try to grow them, it'll need to be from seed.
Herbs: Buy plants for almost everything but dill and perhaps basil, and put them somewhere permanent, because most will be perennials. (Check the tag for perennial versus annual.) They like full sun but will tolerate poor soil.
Raspberries: Some shade tolerance. Very little work, except to keep them under control. Very rewarding. But they spread like mad and you won't really get much of a harvest until next year.