Install MSVS as you are using windows, choose a solution in your Hercules folder (Hercules-12.sln, or Hercules-13.sln, or Hercules-15.sln), open it, and build your solution.
There is a lot of tutorial out there.
@Virtue @fiction Fixed in https://github.com/dastgirp/eBG/commit/4b601d351507a112d627c14717d37ca114e3974f
@Axl Fixed it in https://github.com/dastgirp/eBG/commit/2a5ebb57525fb17a36913b423a9282cab18248d7 (Now BG/WoE Items can only be consumed by skills in BG/WoE Maps)