Break up your soil by using a shovel. Clay soil tends to be compact, so using these types of tools will make the next tasks easier.
Till the clay ground with a spading fork. Use a rototiller if the ground is especially hard.
Rake the ground to break up clay clumps.
Amend the clay ground with loose topsoil. Add compost or animal manure to provide plant nutrients.
Add sawdust and bark to help improve permeability.
Mix all amendments into the soil and rake the ground smooth.