After preferably both a core set and a basic set:
1. Campaign setting - they are saying FRCS
2. Adventures - lots of them, start with a few very polished
3. Advanced classes - so they don't clutter the PHB
4. Advanced races - ditto
5. Advanced campaigns - kingdoms, armies etc. that didn't fit DMG
1. Campaign setting - they are saying FRCS
2. Adventures - lots of them, start with a few very polished
3. Advanced classes - so they don't clutter the PHB
4. Advanced races - ditto
5. Advanced campaigns - kingdoms, armies etc. that didn't fit DMG