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No, ads you see on websites have nothing to do with Rewards. You can and should keep Shields up and have those blocked.
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The X per hour is for notification ads only. And it is the maximum amount and isn’t a guarantee how many you’ll get. Notification ads show in your notification center overall, though newer Brave versions are starting to show as a little temporary window that you can drag to any place along the edge of your browser.
3 & 4. Types of ads you may want to check What types of ads are there?
Pay varies. Often we can use https://sampson.codes/brave/ads/my_region/ to see ad campaigns in your area. If you need help understandng it a bit better, I have an old topic on it at , which OS they are available on, the maximum times you can view those ads, which type of ad they are, how much they pay, etc.
I have an old topic explaining everything on that site if you need help understanding it. You can find that at Understanding Brave Ads Catalog Viewer