Great engine and I'll have to agree on the 11-5 or 11-6 prop, but for a beginner, if your club doesn't have a strict noise rule, I would go with the Master Airscrew.

The APC props are the best and I use them on most every engine I have, but beginners tend to scuff props on the runway or break then. The MA "rubber" props will grind off on hard surface or scuff up in the grass where as the APC may break off a tip. Once you get to landing well and really want more power, go with the APC. For learning, go cheap.

For break in, don't run your engine 4-cycling rich. Give it a few, short runs just lean with cooling in between.