You will need to do a heat load calculation for your cabin. This is the standard method used to size furnaces, air conditioners, heat pumps, etc. Figure out how many BTUs you will lose in an hour on the coldest night, size your heat system appropriately, and stay warm. Google should bring up trial applications that can at least get you in the ballpark. Plug in numbers for wall insulation, window sizes and insulation, attic insulation, spray or rigid foam insulation under the slab, etc and exterior dimensions.
As far as wind goes, don't bother with systems that don't have the turbine at least 30 feet above the nearest trees / mountains / whatever that are within 300 feet. Also don't bother with systems that have a small rotor diameter. 2 meter (6 foot) is what I would consider minimum, 3 meter or larger will let you produce useful energy. Higher system voltage is also a plus.