I bought a home in 2016. I am not seeing where I can enter information for closing costs, home improvements, etc.

 Go to Federal> Deductions and Credits> Your Home to enter mortgage interest, property taxes, private mortgage insurance and loan origination fees (“points”) that you paid in 2016.  You should have a 1098 from your mortgage lender that shows this information.

Your closing costs on your new home are not deductible except for prepaid interest, prepaid property tax or loan origination fees.  There are no deductions for appraisal, inspections, settlement fees. etc.

Your homeowners insurance for fire, hazard, flood, etc. is not deductible for your own home.

Improvements you made to your home are not deductible.  They add to the cost basis for someday when you sell the house,  Save your reccords.