How to run successful campaign on Facebook to increase sell of WordPress Plugin?

Hi Everyone

We hope some of Power Elite Authors has asked the same question when they were at the same position as we are now. Struggling to increase sale of WordPress plugin.

We decided to run advertisement on Facebook so we can target the right audience.
Can anyone please share his experience , When and How to make it successful.

We are just wasting our money and not getting any more sales.
If someone in the past has run advertisement on Facebook please share the detail with us.

Looking forward to the right guidance.
Thank You