No big equipment. Leave that to the overgrown 4-year olds who like to go "VROOM-VROOM!" and splash lots of mud around. What you want to do is build a chinampa
out of the whole place by crushing and mashing down the vegetation that is in place. If you can slash and burn, do that. If the local authorities won't let you burn, then just slash and let it rot down. Are there tree trimming services in your area? Tell them you have a place they can dump their trucks, and they will be happy to come and pile up 3-4' of biomass.
So what do you do when you have a pile that is 3' higher than the streets on 3 sides? Take a bag of topsoil, spread it to about 2" thick, and plant vines that will take off and ramble into it: Seminole pumpkin, Lagenaria type gourds, watermelons, anything that people complain about it taking over their garden.
Another thing you could do is to plant swamp trees along the property lines to help stabilize the soil. The two best types for this are water tupelo, and my favorite, bald cypress
. Willow is also a good tree to consider. It is a good biomass generator, and it will transpire a lot of water out of the soil and up into the air.
It may be too cold where you are for citrus. Zone 9 is iffy, because if you get a couple of 25 degree nights, that can do major damage to the citrus that will take a long time to recover from. Look for the more cold hardy citrus varieties like kumquats and mandarins. Loquat should do great there, it will fruit as long as it doesn't have to put up with too many <25 degree nights.
Blueberries like a good bit of shade, so you can plant them under trees that you want to keep. All the others that you mentioned are reasonable to try. Don't be afraid to experiment, to put something in, and then to rip it out if it is disappointing. Soon you will hit upon what works well.