Pass block awareness > pass block tech > pass block power > block consistency.
Toughness and conditioning as secondaries as needed to keep your bars wherever you want them.
If you're getting beat by guys going unblocked around the edge, pump footwork>quickness>sprinting.
In rookie, it's mostly about making sure you get a hand on a rusher. At least stop them for a moment. Later, you can actually work on trying to give the QB a sweet pocket for extra ticks in passing situations against 3-5 rushers.