You've got a sale of land to report. What you did with the money doesn't matter.
As a separate transaction, you've bought a piece of property that will eventually be turned into a be rental property, once you've started renting it, you can start depreciating the rental property and get some deductions for it..
You have nothing to "write off" for 2018
♪♫•*¨*•.¸¸♥Lisa♥ ¸¸.•*¨*•♫♪