How will people know that you have shops open on your ship? Will information be available on the mobiGlas or map?

Currently, there isn't a specific mechanic to allow owners to advertise that their ship is open for business. However, there are plenty of ways to get the word out, including in-game chat and Spectrum. Plus, the Kraken Privateer isn't the most subtle ship, so it should get plenty of passing trade if parked in a high-traffic location.