Again, the following represents my personal opinion and may be wrong, so please judge for yourself.
Regarding how an offer starts:
I stick to the cpa model to start.
I have seen some beginners start running from the SCPM bidding model with minimal bids, imagine the kind of traffic you will get, I think it's some junk traffic with hardly anyone competing for it, and the probability of losing money is high. So even if you use the SCPM model, you should start with a higher bid, not minimal. The easier it is to convert zones, the more people compete, the higher the price.
The cpa model will try many zones, high bids, low bids, and you can try more quality zones for very little money. When the cpa model finds converting zones, you can try to build whitelisted ad campaigns individually. Don't be afraid of high bid areas.
If the offer is multi-geos, when you find a zone that converts easily in one country, try expanding to other countries with the same zone, most of the time, it works just as well.
Using this offer as an example, I first found the top geos and used cpa 0. 01 to create separate campaigns for the top geos. At this point in time there were some countries that didn't convert, some that converted once, and some that converted many times. I'll start with the countries with more than 2 conversions and create new campaigns with cpa 0.02 or 0.1 to get more conversions. Check the conversion zones where conversions happen, create separate ad campaigns and use the max bid scpm model. cpa 0. 01 model will lose traffic very quickly, and in my experience, a single geo cpa 0. 01 model, will probably lose traffic after a few hours. If there is hope, or if there is not enough data to tell, you need to duplicate the campaign once to get the traffic going again. When the cpa is greater than 0. 1, the traffic will probably last a couple days. My cpa pricing is usually 0.01 0.02 0.05 0.1 0.2 0.5 Sometimes my cpa bids go over payouts, but not by much. Keep an eye on the SCPM campaigns for max bids, so if it's losing money you need to stop it in time or it will cost you a lot of money.