Read these. It’s all you need to know about how the system works.
From there you can pretty much paint a picture of what their system needs to work for you.
How do I change the budget for my ad set?
Budget, Bidding, Scheduling & Charges
Understanding minimum budgets.
We require you to meet a minimum budget to help us strive for consistent delivery of your ads. Minimum budgets are calculated as a daily amount, but apply whether an ad set is using a daily or lifetime budget. For example, if you’re using a lifetime budget for an ad that’s going to run for five days, the budget must be five times the daily minimum budget. These minimums apply whether you’re using automatic or manual bidding.
Ad sets that are setting budgets in the following currencies (USD, AUD, CAD, SGD, JPY, NZD, TWD, EUR, CHF, SEK, HKD, GBP, ILS, NOK, KRW, DKK) are required to meet the following minimums:
My ads are similar. Why are they performing differently?
Dealing with overlapping audiences.
Why did my cost per result go up when I increased my budget?
How do bid and budget changes affect ad performance?
Understanding the Impact of Reach and Frequency
What’s the difference between average and maximum cost bidding?