What is the process to follow after arriving in Thailand with a Non-B visa?

After arriving in Thailand with a Non-B visa for 90 days, you should obtain your work permit and necessary documentation from your employer to apply for a yearly extension of stay based on employment. Make sure to visit the local Immigration office to get a handout with the requirements for the one-year Extension of Stay. It is crucial to apply for this extension within the timeframe of 30 days before your 90-day stay expires.