Where to test creatives with “Staggered Bids” strategy on pop traffic

I’m a little confused about where to test new creatives when creating staggered bid campaigns for pop traffic. From what i understand you have your main (original) campaign where you run a standard bid to uncover new sources to either add to your “profits campaign” or “low bid campaign”.

But what is the best place to test new landers? Obviously you would f ...