The first think that the Soviets did was kill off all the land owners, who were the people that actually knew how to cultivate that land, which caused a huge famine.
That's... not at all what happened. The land owners largely emigrated after the conclusion of the Russian Civil War, and they didn't know jack shit about farming, leaving behind the peasantry. Things were fine on the agricultural front up until around 1928. The cause of the Soviet-wide famine in 1930 was the forced collectivization started in 1928, in which poorly-run kolkhoz were given frankly absurd conditions and shuffled labor around without concern for skill or morale. It wasn't that those who knew how to farm were killed or even thrown out - it was that they were simply ignored, or rather, had their input in a system that was notoriously slow to change in response to conditions.
Then they murdered Ukrainians by forcibly exporting grain at a much higher rate than the rest of the Soviet Union.