Actually didn’t address any of them. all you did was give an opinion and say what you yourself had or had not done. Yes or no am I allowed to do those things. Quote scripture if you like, the Early Church Fathers, what ever floats your boat. But I definitely need a Yes or now answer.
In Romans 13, the Bible instructs Christians to obey the government because God has placed it in power,
The governments of the world have decided that Slavery is no longer allowed, thus no you are not allowed to sell anyone. However if those laws changed and slavery was once again allowed then yes you would need to follow all the commandments concerning the just way to treat slaves you might own.