The chart for your chosen STAR should have go-around procedures. For example, here’s the chart for the KLAS ILS 26L approach:
From the Hold, you then setup your approach again. In the sim, you just exit the hold when you’re ready, usually with something like a DIRECT to your initial approach fix. With VATSIM or in real life, you’d do whatever the Approach/Tower/Departure controller(s) tell you to do after you announce the go-around.