You're going about it the right way. Ask the right questions. Not sure your business ideas have substance. We started in Thailand 12 years ago and it was a tough call. The first thing you will learn is that nothing good happens here without personal introductions to Thais within the field of your business. We had a lot of issues and in the end I just sold the Thai part of our business to Thai national as this was at the time our best option and I was out of it and so was the stress. Thailand is still a great country and with a unique business idea, and local contacts you can build something. Good luck 🤞
You are not a prize idiot. Trouble is if there's no agreement you have no leg to stand on. Police will not help here. Put it down to experience and move on.