OP, I think your next step, if you haven’t done it yet, is to get on the island and see what you can learn from visiting local burger shops. I think if you got passion for opening up shop, go for it, but make sure you have done the necessary research! Some users here have opened up shop and can probably give you good pointers, but you gotta figure out what works and what doesn’t.
Did you guys get to try out Otto pizza (behind Ming Yao Dpt Store in east district) while it was still open? I’m not one for Italian style pizza, but that place was bomb.com