How do I start the server?
You can start it like any other .exe on Windows. There is nothing special about Go executables. Just be aware that Go exes are command-line exes, so if you double-click a Go binary, most likely Windows will open a command prompt window and execute the binary there.
Is this HW enough?
Short answer: Yes.
Long answer: There is no answer to this question. How many requests per second are coming in? How high is the CPU load / memory footprint etc. per request? How long does it take to handle a single request? Unless you know all of this (or at least have a rough idea), there is no way to tell whether the hardware is fast enough.
As a rule of thumb, unless your hardware is something like a Raspberry Pi Zero, it is probably fast enough and large enough. (And even on a Pi Zero you can run a Web server - as said, it depends on the workload.)