Here is what one member is doing to raise vegetables in containers. This would be very easy to adapt to your growing zone.
The thread "Raised Garden Bed Idea" in
Containers forum
I have grown veggies and some fruit in raised beds, and found this to be much more productive than regular row gardening. The yield seems to be much higher than growing in the ground.
We used a compost mix from out local farm store, and also a sandy loam mix from the same farm store. Both gave great results. You can make the raised beds any size you want, or containers of any size.
Would love to see what you come up with and how it works for you.