The best to start with is to have a look at Wix# product documentation https://github.com/oleg-shilo/wixsharp. Wiki there has a few step-by-step tutorials.
As for your problem,
Though, the only action that
You can use GitHub (current project hosting) for further discussions/questions.
As for your problem,
cscs.exe is distributed along with install.cmd thus the only explanation I can come up with is that somehow you didn't extract the all files correctly.Though, the only action that
install.cmd does is setting up the environment variables. Open the file in Notepad and you will understand what it does and you will be able to do the failing step manually. But... something tells me that you may be better off with NuGet package and the VS templates as it is described on Wiki. You can use GitHub (current project hosting) for further discussions/questions.