Across the Country, most taxes run about 1 1/4% to 1 1/2%.
There are many exceptions, especially in areas like N.Y. and N.J.
Also, most counties have two basic ways to determine the taxes:
It can be computed on the last selling price, or,
It can be set by the Assessor from his own formula.
I would suggest you contact a local Realtor to help you and represent you;
many questions will be answered and his services are free.
good luck and may God bless