How large of an area will 1500 hairs cover?

It is best to contact your doctor about pre operative questions.  1500 grafts will cover an area you and your doctor agree to. It may be a very small area or a large area.

The answer depends on what area you are covering and the starting density of that area.  If you are completely bald than 1500 grafts many not cover much area vs. filling in some thinning.  

A great first step would be an online consultation. Often you can submit photos to top hair restoration surgeons for a complimentary evaluation and assessment. This should help lead you in the right direction. Having multiple consultations with different doctors will let you know your best options.