Pardon me if this is rudimentary, how do the credits work?

1.) Am I able to import unlimited images and videos for marketing/ads and video editing.

2.) How advance is the video editor.

3.) If I want to offer this as a service, or even SaaS... am I able to offer custom/ individual pricing (e.g. $25 for a video edit, $35 for a facebook ad custom template) and on the membership side (on the SaaS side if offered here.) am I able to charge monthly.