using smite evil I will have against outsider +3 (CHA) on attacks and 3(lvl)+2*3(increase to 2 point per lvl)=9 on first successful attack's damage. Am I right?
Incorrect. Smite Evil is Cha to hit and Level to damage. When against an Evil Undead, Dragon, Outsider (or Antipaladin) The Level to damage simply doubles for the first strike. So the calculation in your example would be Cha (+3) to hit and Paladin Levelx2 (+6) to damage, then Paladin level (+3)from that point on.