Parent's Health insurance premium

Our annual income is 400k. We will now add one parent as a dependent, and this parent is a new immigrant with no annual income. I will purchase insurance for this parent at a premium of about 12000USD per year. My questions...

 

-Can I get a ballpark estimate by how much I will reduce my annual taxes by adding a new dependent?

-Can I itemize 12000USD health insurance premium as deductible?