Start with har gow - shrimp dumplings. They used to come around with carts and you'd point at what you wanted or nod when they offered, but at the place I go, they stopped that with Covid and now you mark on a sheet what you want and they bring it. They come with 2-4 pieces in a dish so everyone gets one.
Try shrimp dumplings, pork dumplings, soup dumplings. Siu mye basically means dumpling - mushed up meat or seafood or veg in a little pastry thingie. We also likes prawns, chicken buns, rice noodle soup, satay chicken, chinese broccoli.
When I try a new cuisine my rule is that I try it three times because sometimes you need to try from a different restaurant, or ordering new things, etc.