Yup, raised bed there, just not raised too high.
There are professional market gardeners that really perfected the raised beds and theirs are just 6 inch high mounds with walk ways in the middle, no side walls.
Anyway, you're renting and want to stay cheap. What do you have for tools? Do you have or can you borrow a digging fork for a day / weekend? A digging fork has 4 heavy square tines about 8" long and usually only has a short D handle on it.
This is an example.
Cheap and easy way to do a garden here:
- Sprinkle on a granulated general fertilizer. Maybe look for a weaker set of N-P-K numbers.
- Take that digging fork and use it to breakup the ground. (see below).
- Cover the whole bed with 2 or so inches of natural mulch.
Breaking up the soil is easier to show than describe. Working backwards down the garden step the fork into the ground and lever it back a little to slightly lift and breakup the clods. Pull the fork out and move about 4 inches back. Step it in again and lever it so it lifts toward the area you just lifted. Just lever it a little don't really try to dig it out and pick up scoops of soil.
Mulch is like a nice cozy blanket for the garden. It helps with so much:
- Reducing weeds and making the weeds that do popup much easier to pull and remove.
- Hold water in to the bed during the hot summer.
- Protect the soil from heavy rain impacts.
- Reduces the splash up of soil and mud onto your veggies.
Now if you were to keep this garden bed long term you would NOT want to roto-till the mulch into the soil. Tilling mulch into soil will cause problems.