Is that a 2 or 4 strokes engine ? An engine is best broken in at long outings varying throtttle range from time to time with short wot bursts.
Throttle same for the remaining hours, after that go for a full 5/10 minutes wot spin as if you were stealling that combo. Try not to pass 6k if being alone.
Portable engines placed on light boats usually will delivered max factory stated wot rpm and sometimes even sligh passing them. Stay with that prop, as you start to put weight on boat rpm will drop accordingly.
If it's a 4 stroke must change oil/oil filter/lower unit gear oil after break in period.
BTW, which boat type is it ?