Explanation
You need at least 100 events or users who have made a specific action on your website for you to be able to build a similar audience.
In this case, you still don't have enough events or users who have purchased on your website (72); so you are left with two options:
* Build similar audiences based on people who have visited the main landing page of the product.
* Build similar audiences based on people who have made specific actions events on your website: Add To Cart and Initiate Checkout as they both have more than 100 registered actions.
You don't necessarily want to start building an audience from all website visitors as this might be too broad.
You want to build your audiences first based on the bottom of the funnel and then move up.

Explanation
An ad set or campaign with a budget in one of the following currencies (USD, AUD, CAD, SGD, JPY, NZD, TWD, EUR, CHF, SEK, HKD, GBP, ILS, NOK, KRW, DKK) is required to meet the following minimums:
* If it gets charged for impressions, its daily budget must be at least $1 a day
* If it gets charged for clicks, Likes, video views or post engagement, its daily budget must be at least $5 a day
* If it gets charged for low frequency events like offer claims or app installs, its budget must be at least
$40 a day
An ad set or campaign with a budget in other currencies is required to meet the following minimums:
* If it gets charged for impressions, its daily budget must be at least $0.50 a day
* If it gets charged for clicks, Likes, video views, or post engagement, its daily budget must be at least
$2.50 a day
* If it gets charged for low frequency events like offer claims or app installs, its budget must be at least
$20 a day

Explanation
Create a Business Manager if:
* Your business has a marketing team: You have more than one person working on your business marketing or more than one person managing your current Facebook or Instagram business presence.
* You manage assets: You manage multiple Facebook or Instagram assets such as Facebook Pages, ad accounts or apps.
* You use a vendor: You work with vendors to help create, run or manage your Pages or ads, but want your business to maintain ownership of all Pages, ad accounts and assets.
* You need control over access and permissions: You want to maintain complete jurisdiction over your assets without attributing ownership to individuals who assist your business operations.
* You want your business to grow: You want the ability to request access to other pages, ad accounts and apps, or share your pages, ads accounts, and apps with other agencies.
* You need to keep your business secure: Business Manager is currently rolling out new security safeguard tools through the new Security Center to better ensure you maintain control of your assets.

Explanation
Accelerated delivery is a great choice for time-sensitive campaigns.In this case: offers have specific deadlines and need to run through your budget, but not overspend.
You will always need to set up a budget, and maximum bidding costs, as required by the configuration for accelerated delivery.
Keep in mind that accelerated delivery will spend your budget as quickly as possible.