No need to be confused, it is very straightforward. You get paid per monetized views (not all views are monetized, because of ad-blockers, people skipping ads, etc.). Every monetized view counts across all videos. The 1000 views thing (RPM, or revenue per mille, mille means thousand) is just there to make it easier to quantify the money you receive.
Or, to make it even simpler: any video gets a monetized view, you get paid for that monetized view. What you get paid per 1000 views is your RPM. Your RPM is determined by things like type of ad served, location of the viewer, and a couple of other factors. Full stop.