Start with the engine manufacturer's recommended carb needle settings. You can start and run a motor out of the motor for a short period of time, but you must be careful not to overheat it. I recommend running at least a couple tanks of gas through it before doing running it wide open for long periods of time. Typically to break in a motor it is best to vary throttle a lot during the first few tankfuls. If the manufacturer sent break in instructions, follow them. Double check every screws, nuts and bolts on the boat for tightness. Bring some basic tools with you to the pond and make sure you have a safe retrieval method.

Good luck!