What are some ideas to landscape a huge mound of dirt 86'x24'x4'?

First , I'm so sorry you had to go through the flooding and I sympathize . It was awful for us all .

Now its time to find beauty in tragedy and rebuild . Azalea do really well in this climate as do lilies (day lily, cala lily, spider lily ) gardenia do too. Best of luck to you in your new home !

Once your home is on the land where you are going to leave it you can actually see where you would like things to go because you will know where the driveway and any other things like sidewalks are going to be. I am assuming most all of your land will be on the hill, so you will need to think about terracing for any gardens you will want to plant. You can go with many small terraces and perhaps a larger one incorporated into the mix to use as a patio area . Good luck with your starting over, but now you have a fresh pallet to work with into your dream landscaping instead of having to work with what the last owners had put in. Have fun and enjoy your new home!

A good tight sod lawn to hold the dirt in place so that it does not wash away from rain or flood run off. After that you can plant anything else you want, shrubs like azaleas or anything else you like around the mobile home skirting. You could plant shade trees or make a vegetable garden. You could make borders of annual flowers under your shrubs, plant bulbs in fall to bloom in spring. It will be yours to decide what you want it to look like. Drive around and look at plantings you like, look in gardening magazines, write down the plants you like. Then make a sketch of the mobile home placement on your lot and go shopping. Be sure to check prices at several nurseries so you get the best buy. I think trees and shrubs can be planted almost any time in Louisiana; if you plant in fall or winter, they will bloom come spring and summer. You can start a veggie garden and plant annuals in spring and summer. I am from Florida and really miss the flowers and vegetables I could grow in the south. I loved dog wood, redbud, magnolia, crape myrtle and moss covered oak trees. Have fun and make it your own.