Using carpet to establish beds
I just moved into a house in the coastal area of the panhandle of Florida and have an expanse of grass surrounded by the standard 6 ft. board privacy fence in my backyard. I want to establish several fruiting bushes and small trees from figs, pomagranates to satsumas. Those will go in the sandy "soil" this fall. Under and in front of them and including unplanted areas on the fence line, I want to establish a four foot deep bed ( 2 ft for front vegetable plants) that surrounds the back yard along the fence line. The backyard faces south and is mostly sunny so it is perfect for growing vegetables along the fence for now.
I just had all the wall to wall carpet and underpad removed to replace with with wood flooring and saved it in four foot wide rolls to use to establish the beds. I can build the beds and divide the areas off for planting in the square foot method.
My question is: What is the best way to build the beds using the carpet as a base?
I think I will have to wheel barrow in hay bale by bale for mulch this fall and winter. I have been saving all paper products that will decompose readily and much of the kitchen garbage already goes to the compost area but mulch has been lacking and hard to find. I am new here and so still searching out sources.
I appreciate any pointers. Thanks.