What type of switch do I need to plug into a gosund outlet to open and close a garage door?
The garage door needs safety switches, as well as a reversing switch, a switch to detect end of travel (limit switch) and a switch to detect that correct force has  been applied to keep the door closed. Simply turning the power to the whole door-opener on and off does nothing.

If you want to use the Gosund outlet to bypass the remote control terminals, you'd need to rewire the inside of the Gosund switch, or use an external 120 VAC relay to provide only momentary switched contacts without 120 VAC applied across them. From your question, this appears to beyond your current capabilities, and could lead to shocking results.