Campaign House Rules

These are the house rules my new D&D campaign will operate under:

1. Ability generation is 3d6 six times, any order, drop 2 to raise prime requisite by 1
2. Max HP's at 1st level
3. Attack roll of 1 is an automatic miss
4. Attack roll of 20 is a crit, does maximum damage
5. Main reference book is Moldvay Red Basic but I may refer to Holmes Basic or the Compendium as needed.

That's really all at this point. I'm sure other things will come up but I'm trying to keep it light at the start.