My number 1 goal for my mini urban farm is that it is sustainable.
Gathering structures and materials from many sources. I collect old satelite dishes to create birdbaths. It's a great water source for the birds, I mosaic them, it adds art and color to the garden. I love recycling materials that may have gone into the landfills or just dumped in vacant lots.
A garden will not survive with out water. Plan on your water source
A step by step action plan to get your zones in place Closest to your home is where you should have what I call homebase. This is your kitchen vegetables. Next zone could be your garden office/ prep area, then would be dining picnic table area further out would be orchard and compost. Yes I do this, on a city lot. Use what you have.
Once you have a plan, a garden is only as good as the environment it is in. Will it have enough sunlight, what about water run off or pooling? Have you thought about compost? Here is a quick compost 101 if you need some help with that