Tier 1 or Tier 3 countries to achieve first profitable campaign in CPA

[Jan1]

I am not sure about this one, do I look for offers from Tier 1 countries or Tier 3. I heard somewhere that it is a mistake to start with Tier 1. What do you think, do I look for offers from Tier 1 or 3 countries if I am just starting in CPA and trying to make my first