How do I properly break in a turbo?

Once installed, prevent the engine from firing and crank it over until the oil pressure gauges moves (or oil light goes out). Once you have built up oil pressure, undo your engine firing prevention and start it up.

Get the car up to temp (idle) and look for leaks.

Go out for a spin and slowly spool the turbo and watch your boost gauge and for any visible signs of issues (smoke out the tail pipe, not able to build boost, etc)