What should I level first in Diablo 2?

What should I level first in Diablo 2?
Stages:

Level 1 – 15: Repeatedly clear Tristram.
Level 15 – 24: Clear Tal Rasha’s Tombs in the Canyon of the Magi.
Level 24: Complete Rite of Passage.
Level 25 – 40: Repeatedly clear the Chaos Sanctuary and Baal.
Level 40: Complete Rite of Passage (nightmare difficulty).

Stages:
  1. Level 1 – 15: Repeatedly clear Tristram.
  2. Level 15 – 24: Clear Tal Rasha’s Tombs in the Canyon of the Magi.
  3. Level 24: Complete Rite of Passage.
  4. Level 25 – 40: Repeatedly clear the Chaos Sanctuary and Baal.
  5. Level 40: Complete Rite of Passage (nightmare difficulty).