We were thinking about switching to solar power for heat? How much and where to start?

We have forced oil which is not allowed by our loan we received on our new house which is 200 years old. The house is currently 1,300 square feet. Instead of switching to gas, we were interested in solar power. How to I begin the research on this and where to buy?
Also how $$ is doing something like this? We don’t know anyone with solar power so any comments or suggestions would be great.
IN NJ!!!!!!!!!!!!!!!!!!