Farm Machinery Advice

I need some advice on Farm Machinery.

I have land 20 acres that has not been farmed for 30 years, it is flat with grass and vegetation.

I need advice on plough machinery. I see that some people Buy or Rent tractors and I see online Hand Plough ( diesel or electric)

Some places refer to the diesel/petrol hand plough as rotovator

Has anyone advice on the Hand ( diesel or petrol) ploughs ? are they good. what Horsepower/Engine is good. maybe even recommend a hand plough.