Your channel, on autopilot.

Yes - a scheduled episode is charged exactly like a manual render of the same length and quality, drawn from your regular credit balance. There's no separate pool for series, and a failed episode is refunded automatically the same way a failed manual render is.

Yes on both counts - you can connect several accounts on the same platform, and how many concurrent series you can run at once scales with your plan (Starter gets one, Growth up to five). Multiple series can post to the same or different accounts.

Nothing you need to act on - that's what full autopilot is for. If you'd rather approve each one, keep the account disconnected from the series (or use Library review) and publish manually once you've watched it.

On the Pro plan, connected accounts belong to the workspace rather than to whoever connected them, so any teammate can publish to a shared channel - useful for running several brands' worth of series from one account.