You will get about 500 opinions on this, but mine is that you should leave the original oil fill in at least until the end of the break-in period. I (and a lot of other people) feel that changing the oil before then slows down the break-in so it's better to not change. Once the break-in period is up, do what you want.

I also feel it's a good idea to use all of the engine speed range during break-in. You don't want to work the engine hard by accelerating heavily, but you do want to vary the revs and use the range. That will help loosen up the engine.